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+Scientific Reference Man Pages
+==============================
+
+Note: These manpages use Unicode extensively and are written for
+[mandoc](https://mandoc.bsd.lv/).
+
+elements.7
+----------
+
+The periodic table of the elements, rotated 90 degrees to fit into a
+standard width terminal.
+
+constants.7
+-----------
+
+The [CODATA Values of the Fundamental Physical Constants][1].
+
+[1]: https://physics.nist.gov/cuu/Constants/index.html
+
+si.7
+----
+
+A reference for the SI units. Includes
+
+* Values of prefixes
+* All base and derived units with names from the SI brochure
+* All accepted non-SI units
+* Conversions between some non-SI units and SI equivalents
+
+How to Install
+==============
+
+Place into your system's manual page directory (on most systems, this
+will be `/usr/local/share/man/man7`), and run `makewhatis` as root.
diff --git a/constants.7 b/constants.7
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+.Dd $Mdocdate: April 2 2022 $
+.Dt constants 7
+.Os
+.Sh NAME
+.Nm constants ,
+.Nm codata
+.Nd CODATA Recommended Values of the Fundamental Physical Constants
+.Sh DESCRIPTION
+Numbers are given in programmer's notation:
+.Dq x10⁻³
+is rendered as
+.Dq e-3 .
+Values in parenthesis is the uncertainty.
+.Sh CONSTANTS
+.Ss alpha particle-electron mass ratio
+7294.299 541 42 (0.000 000 24)
+.Ss alpha particle mass
+6.644 657 3357 e-27 (kg) (0.000 000 0020 e-27)
+.Ss alpha particle mass energy equivalent
+5.971 920 1914 e-10 (J) (0.000 000 0018 e-10)
+.Ss alpha particle mass energy equivalent in MeV
+3727.379 4066 (MeV) (0.000 0011)
+.Ss alpha particle mass in u
+4.001 506 179 127 (u) (0.000 000 000 063)
+.Ss alpha particle molar mass
+4.001 506 1777 e-3 (kg mol^-1) (0.000 000 0012 e-3)
+.Ss alpha particle-proton mass ratio
+3.972 599 690 09 (0.000 000 000 22)
+.Ss alpha particle relative atomic mass
+4.001 506 179 127 (0.000 000 000 063)
+.Ss Angstrom star
+1.000 014 95 e-10 (m) (0.000 000 90 e-10)
+.Ss atomic mass constant
+1.660 539 066 60 e-27 (kg) (0.000 000 000 50 e-27)
+.Ss atomic mass constant energy equivalent
+1.492 418 085 60 e-10 (J) (0.000 000 000 45 e-10)
+.Ss atomic mass constant energy equivalent in MeV
+931.494 102 42 (MeV) (0.000 000 28)
+.Ss atomic mass unit-electron volt relationship
+9.314 941 0242 e8 (eV) (0.000 000 0028 e8)
+.Ss atomic mass unit-hartree relationship
+3.423 177 6874 e7 (E_h) (0.000 000 0010 e7)
+.Ss atomic mass unit-hertz relationship
+2.252 342 718 71 e23 (Hz) (0.000 000 000 68 e23)
+.Ss atomic mass unit-inverse meter relationship
+7.513 006 6104 e14 (m^-1) (0.000 000 0023 e14)
+.Ss atomic mass unit-joule relationship
+1.492 418 085 60 e-10 (J) (0.000 000 000 45 e-10)
+.Ss atomic mass unit-kelvin relationship
+1.080 954 019 16 e13 (K) (0.000 000 000 33 e13)
+.Ss atomic mass unit-kilogram relationship
+1.660 539 066 60 e-27 (kg) (0.000 000 000 50 e-27)
+.Ss atomic unit of 1st hyperpolarizability
+3.206 361 3061 e-53 (C^3 m^3 J^-2) (0.000 000 0015 e-53)
+.Ss atomic unit of 2nd hyperpolarizability
+6.235 379 9905 e-65 (C^4 m^4 J^-3) (0.000 000 0038 e-65)
+.Ss atomic unit of action
+1.054 571 817... e-34 (J s) (exact)
+.Ss atomic unit of charge
+1.602 176 634 e-19 (C) (exact)
+.Ss atomic unit of charge density
+1.081 202 384 57 e12 (C m^-3) (0.000 000 000 49 e12)
+.Ss atomic unit of current
+6.623 618 237 510 e-3 (A) (0.000 000 000 013 e-3)
+.Ss atomic unit of electric dipole mom.
+8.478 353 6255 e-30 (C m) (0.000 000 0013 e-30)
+.Ss atomic unit of electric field
+5.142 206 747 63 e11 (V m^-1) (0.000 000 000 78 e11)
+.Ss atomic unit of electric field gradient
+9.717 362 4292 e21 (V m^-2) (0.000 000 0029 e21)
+.Ss atomic unit of electric polarizability
+1.648 777 274 36 e-41 (C^2 m^2 J^-1) (0.000 000 000 50 e-41)
+.Ss atomic unit of electric potential
+27.211 386 245 988 (V) (0.000 000 000 053)
+.Ss atomic unit of electric quadrupole mom.
+4.486 551 5246 e-40 (C m^2) (0.000 000 0014 e-40)
+.Ss atomic unit of energy
+4.359 744 722 2071 e-18 (J) (0.000 000 000 0085 e-18)
+.Ss atomic unit of force
+8.238 723 4983 e-8 (N) (0.000 000 0012 e-8)
+.Ss atomic unit of length
+5.291 772 109 03 e-11 (m) (0.000 000 000 80 e-11)
+.Ss atomic unit of mag. dipole mom.
+1.854 802 015 66 e-23 (J T^-1) (0.000 000 000 56 e-23)
+.Ss atomic unit of mag. flux density
+2.350 517 567 58 e5 (T) (0.000 000 000 71 e5)
+.Ss atomic unit of magnetizability
+7.891 036 6008 e-29 (J T^-2) (0.000 000 0048 e-29)
+.Ss atomic unit of mass
+9.109 383 7015 e-31 (kg) (0.000 000 0028 e-31)
+.Ss atomic unit of momentum
+1.992 851 914 10 e-24 (kg m s^-1) (0.000 000 000 30 e-24)
+.Ss atomic unit of permittivity
+1.112 650 055 45 e-10 (F m^-1) (0.000 000 000 17 e-10)
+.Ss atomic unit of time
+2.418 884 326 5857 e-17 (s) (0.000 000 000 0047 e-17)
+.Ss atomic unit of velocity
+2.187 691 263 64 e6 (m s^-1) (0.000 000 000 33 e6)
+.Ss Avogadro constant
+6.022 140 76 e23 (mol^-1) (exact)
+.Ss Bohr magneton
+9.274 010 0783 e-24 (J T^-1) (0.000 000 0028 e-24)
+.Ss Bohr magneton in eV/T
+5.788 381 8060 e-5 (eV T^-1) (0.000 000 0017 e-5)
+.Ss Bohr magneton in Hz/T
+1.399 624 493 61 e10 (Hz T^-1) (0.000 000 000 42 e10)
+.Ss Bohr magneton in inverse meter per tesla
+46.686 447 783 (m^-1 T^-1) (0.000 000 014)
+.Ss Bohr magneton in K/T
+0.671 713 815 63 (K T^-1) (0.000 000 000 20)
+.Ss Bohr radius
+5.291 772 109 03 e-11 (m) (0.000 000 000 80 e-11)
+.Ss Boltzmann constant
+1.380 649 e-23 (J K^-1) (exact)
+.Ss Boltzmann constant in eV/K
+8.617 333 262... e-5 (eV K^-1) (exact)
+.Ss Boltzmann constant in Hz/K
+2.083 661 912... e10 (Hz K^-1) (exact)
+.Ss Boltzmann constant in inverse meter per kelvin
+69.503 480 04... (m^-1 K^-1) (exact)
+.Ss characteristic impedance of vacuum
+376.730 313 668 (ohm) (0.000 000 057)
+.Ss classical electron radius
+2.817 940 3262 e-15 (m) (0.000 000 0013 e-15)
+.Ss Compton wavelength
+2.426 310 238 67 e-12 (m) (0.000 000 000 73 e-12)
+.Ss conductance quantum
+7.748 091 729... e-5 (S) (exact)
+.Ss conventional value of ampere-90
+1.000 000 088 87... (A) (exact)
+.Ss conventional value of coulomb-90
+1.000 000 088 87... (C) (exact)
+.Ss conventional value of farad-90
+0.999 999 982 20... (F) (exact)
+.Ss conventional value of henry-90
+1.000 000 017 79... (H) (exact)
+.Ss conventional value of Josephson constant
+483 597.9 e9 (Hz V^-1) (exact)
+.Ss conventional value of ohm-90
+1.000 000 017 79... (ohm) (exact)
+.Ss conventional value of volt-90
+1.000 000 106 66... (V) (exact)
+.Ss conventional value of von Klitzing constant
+25 812.807 (ohm) (exact)
+.Ss conventional value of watt-90
+1.000 000 195 53... (W) (exact)
+.Ss Copper x unit
+1.002 076 97 e-13 (m) (0.000 000 28 e-13)
+.Ss deuteron-electron mag. mom. ratio
+-4.664 345 551 e-4 (0.000 000 012 e-4)
+.Ss deuteron-electron mass ratio
+3670.482 967 88 (0.000 000 13)
+.Ss deuteron g factor
+0.857 438 2338 (0.000 000 0022)
+.Ss deuteron mag. mom.
+4.330 735 094 e-27 (J T^-1) (0.000 000 011 e-27)
+.Ss deuteron mag. mom. to Bohr magneton ratio
+4.669 754 570 e-4 (0.000 000 012 e-4)
+.Ss deuteron mag. mom. to nuclear magneton ratio
+0.857 438 2338 (0.000 000 0022)
+.Ss deuteron mass
+3.343 583 7724 e-27 (kg) (0.000 000 0010 e-27)
+.Ss deuteron mass energy equivalent
+3.005 063 231 02 e-10 (J) (0.000 000 000 91 e-10)
+.Ss deuteron mass energy equivalent in MeV
+1875.612 942 57 (MeV) (0.000 000 57)
+.Ss deuteron mass in u
+2.013 553 212 745 (u) (0.000 000 000 040)
+.Ss deuteron molar mass
+2.013 553 212 05 e-3 (kg mol^-1) (0.000 000 000 61 e-3)
+.Ss deuteron-neutron mag. mom. ratio
+-0.448 206 53 (0.000 000 11)
+.Ss deuteron-proton mag. mom. ratio
+0.307 012 209 39 (0.000 000 000 79)
+.Ss deuteron-proton mass ratio
+1.999 007 501 39 (0.000 000 000 11)
+.Ss deuteron relative atomic mass
+2.013 553 212 745 (0.000 000 000 040)
+.Ss deuteron rms charge radius
+2.127 99 e-15 (m) (0.000 74 e-15)
+.Ss electron charge to mass quotient
+-1.758 820 010 76 e11 (C kg^-1) (0.000 000 000 53 e11)
+.Ss electron-deuteron mag. mom. ratio
+-2143.923 4915 (0.000 0056)
+.Ss electron-deuteron mass ratio
+2.724 437 107 462 e-4 (0.000 000 000 096 e-4)
+.Ss electron g factor
+-2.002 319 304 362 56 (0.000 000 000 000 35)
+.Ss electron gyromag. ratio
+1.760 859 630 23 e11 (s^-1 T^-1) (0.000 000 000 53 e11)
+.Ss electron gyromag. ratio in MHz/T
+28 024.951 4242 (MHz T^-1) (0.000 0085)
+.Ss electron-helion mass ratio
+1.819 543 074 573 e-4 (0.000 000 000 079 e-4)
+.Ss electron mag. mom.
+-9.284 764 7043 e-24 (J T^-1) (0.000 000 0028 e-24)
+.Ss electron mag. mom. anomaly
+1.159 652 181 28 e-3 (0.000 000 000 18 e-3)
+.Ss electron mag. mom. to Bohr magneton ratio
+-1.001 159 652 181 28 (0.000 000 000 000 18)
+.Ss electron mag. mom. to nuclear magneton ratio
+-1838.281 971 88 (0.000 000 11)
+.Ss electron mass
+9.109 383 7015 e-31 (kg) (0.000 000 0028 e-31)
+.Ss electron mass energy equivalent
+8.187 105 7769 e-14 (J) (0.000 000 0025 e-14)
+.Ss electron mass energy equivalent in MeV
+0.510 998 950 00 (MeV) (0.000 000 000 15)
+.Ss electron mass in u
+5.485 799 090 65 e-4 (u) (0.000 000 000 16 e-4)
+.Ss electron molar mass
+5.485 799 0888 e-7 (kg mol^-1) (0.000 000 0017 e-7)
+.Ss electron-muon mag. mom. ratio
+206.766 9883 (0.000 0046)
+.Ss electron-muon mass ratio
+4.836 331 69 e-3 (0.000 000 11 e-3)
+.Ss electron-neutron mag. mom. ratio
+960.920 50 (0.000 23)
+.Ss electron-neutron mass ratio
+5.438 673 4424 e-4 (0.000 000 0026 e-4)
+.Ss electron-proton mag. mom. ratio
+-658.210 687 89 (0.000 000 20)
+.Ss electron-proton mass ratio
+5.446 170 214 87 e-4 (0.000 000 000 33 e-4)
+.Ss electron relative atomic mass
+5.485 799 090 65 e-4 (0.000 000 000 16 e-4)
+.Ss electron-tau mass ratio
+2.875 85 e-4 (0.000 19 e-4)
+.Ss electron to alpha particle mass ratio
+1.370 933 554 787 e-4 (0.000 000 000 045 e-4)
+.Ss electron to shielded helion mag. mom. ratio
+864.058 257 (0.000 010)
+.Ss electron to shielded proton mag. mom. ratio
+-658.227 5971 (0.000 0072)
+.Ss electron-triton mass ratio
+1.819 200 062 251 e-4 (0.000 000 000 090 e-4)
+.Ss electron volt
+1.602 176 634 e-19 (J) (exact)
+.Ss electron volt-atomic mass unit relationship
+1.073 544 102 33 e-9 (u) (0.000 000 000 32 e-9)
+.Ss electron volt-hartree relationship
+3.674 932 217 5655 e-2 (E_h) (0.000 000 000 0071 e-2)
+.Ss electron volt-hertz relationship
+2.417 989 242... e14 (Hz) (exact)
+.Ss electron volt-inverse meter relationship
+8.065 543 937... e5 (m^-1) (exact)
+.Ss electron volt-joule relationship
+1.602 176 634 e-19 (J) (exact)
+.Ss electron volt-kelvin relationship
+1.160 451 812... e4 (K) (exact)
+.Ss electron volt-kilogram relationship
+1.782 661 921... e-36 (kg) (exact)
+.Ss elementary charge
+1.602 176 634 e-19 (C) (exact)
+.Ss elementary charge over h-bar
+1.519 267 447... e15 (A J^-1) (exact)
+.Ss Faraday constant
+96 485.332 12... (C mol^-1) (exact)
+.Ss Fermi coupling constant
+1.166 3787 e-5 (GeV^-2) (0.000 0006 e-5)
+.Ss fine-structure constant
+7.297 352 5693 e-3 (0.000 000 0011 e-3)
+.Ss first radiation constant
+3.741 771 852... e-16 (W m^2) (exact)
+.Ss first radiation constant for spectral radiance
+1.191 042 972... e-16 (W m^2 sr^-1) (exact)
+.Ss hartree-atomic mass unit relationship
+2.921 262 322 05 e-8 (u) (0.000 000 000 88 e-8)
+.Ss hartree-electron volt relationship
+27.211 386 245 988 (eV) (0.000 000 000 053)
+.Ss Hartree energy
+4.359 744 722 2071 e-18 (J) (0.000 000 000 0085 e-18)
+.Ss Hartree energy in eV
+27.211 386 245 988 (eV) (0.000 000 000 053)
+.Ss hartree-hertz relationship
+6.579 683 920 502 e15 (Hz) (0.000 000 000 013 e15)
+.Ss hartree-inverse meter relationship
+2.194 746 313 6320 e7 (m^-1) (0.000 000 000 0043 e7)
+.Ss hartree-joule relationship
+4.359 744 722 2071 e-18 (J) (0.000 000 000 0085 e-18)
+.Ss hartree-kelvin relationship
+3.157 750 248 0407 e5 (K) (0.000 000 000 0061 e5)
+.Ss hartree-kilogram relationship
+4.850 870 209 5432 e-35 (kg) (0.000 000 000 0094 e-35)
+.Ss helion-electron mass ratio
+5495.885 280 07 (0.000 000 24)
+.Ss helion g factor
+-4.255 250 615 (0.000 000 050)
+.Ss helion mag. mom.
+-1.074 617 532 e-26 (J T^-1) (0.000 000 013 e-26)
+.Ss helion mag. mom. to Bohr magneton ratio
+-1.158 740 958 e-3 (0.000 000 014 e-3)
+.Ss helion mag. mom. to nuclear magneton ratio
+-2.127 625 307 (0.000 000 025)
+.Ss helion mass
+5.006 412 7796 e-27 (kg) (0.000 000 0015 e-27)
+.Ss helion mass energy equivalent
+4.499 539 4125 e-10 (J) (0.000 000 0014 e-10)
+.Ss helion mass energy equivalent in MeV
+2808.391 607 43 (MeV) (0.000 000 85)
+.Ss helion mass in u
+3.014 932 247 175 (u) (0.000 000 000 097)
+.Ss helion molar mass
+3.014 932 246 13 e-3 (kg mol^-1) (0.000 000 000 91 e-3)
+.Ss helion-proton mass ratio
+2.993 152 671 67 (0.000 000 000 13)
+.Ss helion relative atomic mass
+3.014 932 247 175 (0.000 000 000 097)
+.Ss helion shielding shift
+5.996 743 e-5 (0.000 010 e-5)
+.Ss hertz-atomic mass unit relationship
+4.439 821 6652 e-24 (u) (0.000 000 0013 e-24)
+.Ss hertz-electron volt relationship
+4.135 667 696... e-15 (eV) (exact)
+.Ss hertz-hartree relationship
+1.519 829 846 0570 e-16 (E_h) (0.000 000 000 0029 e-16)
+.Ss hertz-inverse meter relationship
+3.335 640 951... e-9 (m^-1) (exact)
+.Ss hertz-joule relationship
+6.626 070 15 e-34 (J) (exact)
+.Ss hertz-kelvin relationship
+4.799 243 073... e-11 (K) (exact)
+.Ss hertz-kilogram relationship
+7.372 497 323... e-51 (kg) (exact)
+.Ss hyperfine transition frequency of Cs-133
+9 192 631 770 (Hz) (exact)
+.Ss inverse fine-structure constant
+137.035 999 084 (0.000 000 021)
+.Ss inverse meter-atomic mass unit relationship
+1.331 025 050 10 e-15 (u) (0.000 000 000 40 e-15)
+.Ss inverse meter-electron volt relationship
+1.239 841 984... e-6 (eV) (exact)
+.Ss inverse meter-hartree relationship
+4.556 335 252 9120 e-8 (E_h) (0.000 000 000 0088 e-8)
+.Ss inverse meter-hertz relationship
+299 792 458 (Hz) (exact)
+.Ss inverse meter-joule relationship
+1.986 445 857... e-25 (J) (exact)
+.Ss inverse meter-kelvin relationship
+1.438 776 877... e-2 (K) (exact)
+.Ss inverse meter-kilogram relationship
+2.210 219 094... e-42 (kg) (exact)
+.Ss inverse of conductance quantum
+12 906.403 72... (ohm) (exact)
+.Ss Josephson constant
+483 597.848 4... e9 (Hz V^-1) (exact)
+.Ss joule-atomic mass unit relationship
+6.700 535 2565 e9 (u) (0.000 000 0020 e9)
+.Ss joule-electron volt relationship
+6.241 509 074... e18 (eV) (exact)
+.Ss joule-hartree relationship
+2.293 712 278 3963 e17 (E_h) (0.000 000 000 0045 e17)
+.Ss joule-hertz relationship
+1.509 190 179... e33 (Hz) (exact)
+.Ss joule-inverse meter relationship
+5.034 116 567... e24 (m^-1) (exact)
+.Ss joule-kelvin relationship
+7.242 970 516... e22 (K) (exact)
+.Ss joule-kilogram relationship
+1.112 650 056... e-17 (kg) (exact)
+.Ss kelvin-atomic mass unit relationship
+9.251 087 3014 e-14 (u) (0.000 000 0028 e-14)
+.Ss kelvin-electron volt relationship
+8.617 333 262... e-5 (eV) (exact)
+.Ss kelvin-hartree relationship
+3.166 811 563 4556 e-6 (E_h) (0.000 000 000 0061 e-6)
+.Ss kelvin-hertz relationship
+2.083 661 912... e10 (Hz) (exact)
+.Ss kelvin-inverse meter relationship
+69.503 480 04... (m^-1) (exact)
+.Ss kelvin-joule relationship
+1.380 649 e-23 (J) (exact)
+.Ss kelvin-kilogram relationship
+1.536 179 187... e-40 (kg) (exact)
+.Ss kilogram-atomic mass unit relationship
+6.022 140 7621 e26 (u) (0.000 000 0018 e26)
+.Ss kilogram-electron volt relationship
+5.609 588 603... e35 (eV) (exact)
+.Ss kilogram-hartree relationship
+2.061 485 788 7409 e34 (E_h) (0.000 000 000 0040 e34)
+.Ss kilogram-hertz relationship
+1.356 392 489... e50 (Hz) (exact)
+.Ss kilogram-inverse meter relationship
+4.524 438 335... e41 (m^-1) (exact)
+.Ss kilogram-joule relationship
+8.987 551 787... e16 (J) (exact)
+.Ss kilogram-kelvin relationship
+6.509 657 260... e39 (K) (exact)
+.Ss lattice parameter of silicon
+5.431 020 511 e-10 (m) (0.000 000 089 e-10)
+.Ss lattice spacing of ideal Si (220)
+1.920 155 716 e-10 (m) (0.000 000 032 e-10)
+.Ss Loschmidt constant (273.15 K, 100 kPa)
+2.651 645 804... e25 (m^-3) (exact)
+.Ss Loschmidt constant (273.15 K, 101.325 kPa)
+2.686 780 111... e25 (m^-3) (exact)
+.Ss luminous efficacy
+683 (lm W^-1) (exact)
+.Ss mag. flux quantum
+2.067 833 848... e-15 (Wb) (exact)
+.Ss molar gas constant
+8.314 462 618... (J mol^-1 K^-1) (exact)
+.Ss molar mass constant
+0.999 999 999 65 e-3 (kg mol^-1) (0.000 000 000 30 e-3)
+.Ss molar mass of carbon-12
+11.999 999 9958 e-3 (kg mol^-1) (0.000 000 0036 e-3)
+.Ss molar Planck constant
+3.990 312 712... e-10 (J Hz^-1 mol^-1) (exact)
+.Ss molar volume of ideal gas (273.15 K, 100 kPa)
+22.710 954 64... e-3 (m^3 mol^-1) (exact)
+.Ss molar volume of ideal gas (273.15 K, 101.325 kPa)
+22.413 969 54... e-3 (m^3 mol^-1) (exact)
+.Ss molar volume of silicon
+1.205 883 199 e-5 (m^3 mol^-1) (0.000 000 060 e-5)
+.Ss Molybdenum x unit
+1.002 099 52 e-13 (m) (0.000 000 53 e-13)
+.Ss muon Compton wavelength
+1.173 444 110 e-14 (m) (0.000 000 026 e-14)
+.Ss muon-electron mass ratio
+206.768 2830 (0.000 0046)
+.Ss muon g factor
+-2.002 331 8418 (0.000 000 0013)
+.Ss muon mag. mom.
+-4.490 448 30 e-26 (J T^-1) (0.000 000 10 e-26)
+.Ss muon mag. mom. anomaly
+1.165 920 89 e-3 (0.000 000 63 e-3)
+.Ss muon mag. mom. to Bohr magneton ratio
+-4.841 970 47 e-3 (0.000 000 11 e-3)
+.Ss muon mag. mom. to nuclear magneton ratio
+-8.890 597 03 (0.000 000 20)
+.Ss muon mass
+1.883 531 627 e-28 (kg) (0.000 000 042 e-28)
+.Ss muon mass energy equivalent
+1.692 833 804 e-11 (J) (0.000 000 038 e-11)
+.Ss muon mass energy equivalent in MeV
+105.658 3755 (MeV) (0.000 0023)
+.Ss muon mass in u
+0.113 428 9259 (u) (0.000 000 0025)
+.Ss muon molar mass
+1.134 289 259 e-4 (kg mol^-1) (0.000 000 025 e-4)
+.Ss muon-neutron mass ratio
+0.112 454 5170 (0.000 000 0025)
+.Ss muon-proton mag. mom. ratio
+-3.183 345 142 (0.000 000 071)
+.Ss muon-proton mass ratio
+0.112 609 5264 (0.000 000 0025)
+.Ss muon-tau mass ratio
+5.946 35 e-2 (0.000 40 e-2)
+.Ss natural unit of action
+1.054 571 817... e-34 (J s) (exact)
+.Ss natural unit of action in eV s
+6.582 119 569... e-16 (eV s) (exact)
+.Ss natural unit of energy
+8.187 105 7769 e-14 (J) (0.000 000 0025 e-14)
+.Ss natural unit of energy in MeV
+0.510 998 950 00 (MeV) (0.000 000 000 15)
+.Ss natural unit of length
+3.861 592 6796 e-13 (m) (0.000 000 0012 e-13)
+.Ss natural unit of mass
+9.109 383 7015 e-31 (kg) (0.000 000 0028 e-31)
+.Ss natural unit of momentum
+2.730 924 530 75 e-22 (kg m s^-1) (0.000 000 000 82 e-22)
+.Ss natural unit of momentum in MeV/c
+0.510 998 950 00 (MeV/c) (0.000 000 000 15)
+.Ss natural unit of time
+1.288 088 668 19 e-21 (s) (0.000 000 000 39 e-21)
+.Ss natural unit of velocity
+299 792 458 (m s^-1) (exact)
+.Ss neutron Compton wavelength
+1.319 590 905 81 e-15 (m) (0.000 000 000 75 e-15)
+.Ss neutron-electron mag. mom. ratio
+1.040 668 82 e-3 (0.000 000 25 e-3)
+.Ss neutron-electron mass ratio
+1838.683 661 73 (0.000 000 89)
+.Ss neutron g factor
+-3.826 085 45 (0.000 000 90)
+.Ss neutron gyromag. ratio
+1.832 471 71 e8 (s^-1 T^-1) (0.000 000 43 e8)
+.Ss neutron gyromag. ratio in MHz/T
+29.164 6931 (MHz T^-1) (0.000 0069)
+.Ss neutron mag. mom.
+-9.662 3651 e-27 (J T^-1) (0.000 0023 e-27)
+.Ss neutron mag. mom. to Bohr magneton ratio
+-1.041 875 63 e-3 (0.000 000 25 e-3)
+.Ss neutron mag. mom. to nuclear magneton ratio
+-1.913 042 73 (0.000 000 45)
+.Ss neutron mass
+1.674 927 498 04 e-27 (kg) (0.000 000 000 95 e-27)
+.Ss neutron mass energy equivalent
+1.505 349 762 87 e-10 (J) (0.000 000 000 86 e-10)
+.Ss neutron mass energy equivalent in MeV
+939.565 420 52 (MeV) (0.000 000 54)
+.Ss neutron mass in u
+1.008 664 915 95 (u) (0.000 000 000 49)
+.Ss neutron molar mass
+1.008 664 915 60 e-3 (kg mol^-1) (0.000 000 000 57 e-3)
+.Ss neutron-muon mass ratio
+8.892 484 06 (0.000 000 20)
+.Ss neutron-proton mag. mom. ratio
+-0.684 979 34 (0.000 000 16)
+.Ss neutron-proton mass difference
+2.305 574 35 e-30 (kg) (0.000 000 82 e-30)
+.Ss neutron-proton mass difference energy equivalent
+2.072 146 89 e-13 (J) (0.000 000 74 e-13)
+.Ss neutron-proton mass difference energy equivalent in MeV
+1.293 332 36 (MeV) (0.000 000 46)
+.Ss neutron-proton mass difference in u
+1.388 449 33 e-3 (u) (0.000 000 49 e-3)
+.Ss neutron-proton mass ratio
+1.001 378 419 31 (0.000 000 000 49)
+.Ss neutron relative atomic mass
+1.008 664 915 95 (0.000 000 000 49)
+.Ss neutron-tau mass ratio
+0.528 779 (0.000 036)
+.Ss neutron to shielded proton mag. mom. ratio
+-0.684 996 94 (0.000 000 16)
+.Ss Newtonian constant of gravitation
+6.674 30 e-11 (m^3 kg^-1 s^-2) (0.000 15 e-11)
+.Ss Newtonian constant of gravitation over h-bar c
+6.708 83 e-39 ((GeV/c^2)^-2) (0.000 15 e-39)
+.Ss nuclear magneton
+5.050 783 7461 e-27 (J T^-1) (0.000 000 0015 e-27)
+.Ss nuclear magneton in eV/T
+3.152 451 258 44 e-8 (eV T^-1) (0.000 000 000 96 e-8)
+.Ss nuclear magneton in inverse meter per tesla
+2.542 623 413 53 e-2 (m^-1 T^-1) (0.000 000 000 78 e-2)
+.Ss nuclear magneton in K/T
+3.658 267 7756 e-4 (K T^-1) (0.000 000 0011 e-4)
+.Ss nuclear magneton in MHz/T
+7.622 593 2291 (MHz T^-1) (0.000 000 0023)
+.Ss Planck constant
+6.626 070 15 e-34 (J Hz^-1) (exact)
+.Ss Planck constant in eV/Hz
+4.135 667 696... e-15 (eV Hz^-1) (exact)
+.Ss Planck length
+1.616 255 e-35 (m) (0.000 018 e-35)
+.Ss Planck mass
+2.176 434 e-8 (kg) (0.000 024 e-8)
+.Ss Planck mass energy equivalent in GeV
+1.220 890 e19 (GeV) (0.000 014 e19)
+.Ss Planck temperature
+1.416 784 e32 (K) (0.000 016 e32)
+.Ss Planck time
+5.391 247 e-44 (s) (0.000 060 e-44)
+.Ss proton charge to mass quotient
+9.578 833 1560 e7 (C kg^-1) (0.000 000 0029 e7)
+.Ss proton Compton wavelength
+1.321 409 855 39 e-15 (m) (0.000 000 000 40 e-15)
+.Ss proton-electron mass ratio
+1836.152 673 43 (0.000 000 11)
+.Ss proton g factor
+5.585 694 6893 (0.000 000 0016)
+.Ss proton gyromag. ratio
+2.675 221 8744 e8 (s^-1 T^-1) (0.000 000 0011 e8)
+.Ss proton gyromag. ratio in MHz/T
+42.577 478 518 (MHz T^-1) (0.000 000 018)
+.Ss proton mag. mom.
+1.410 606 797 36 e-26 (J T^-1) (0.000 000 000 60 e-26)
+.Ss proton mag. mom. to Bohr magneton ratio
+1.521 032 202 30 e-3 (0.000 000 000 46 e-3)
+.Ss proton mag. mom. to nuclear magneton ratio
+2.792 847 344 63 (0.000 000 000 82)
+.Ss proton mag. shielding correction
+2.5689 e-5 (0.0011 e-5)
+.Ss proton mass
+1.672 621 923 69 e-27 (kg) (0.000 000 000 51 e-27)
+.Ss proton mass energy equivalent
+1.503 277 615 98 e-10 (J) (0.000 000 000 46 e-10)
+.Ss proton mass energy equivalent in MeV
+938.272 088 16 (MeV) (0.000 000 29)
+.Ss proton mass in u
+1.007 276 466 621 (u) (0.000 000 000 053)
+.Ss proton molar mass
+1.007 276 466 27 e-3 (kg mol^-1) (0.000 000 000 31 e-3)
+.Ss proton-muon mass ratio
+8.880 243 37 (0.000 000 20)
+.Ss proton-neutron mag. mom. ratio
+-1.459 898 05 (0.000 000 34)
+.Ss proton-neutron mass ratio
+0.998 623 478 12 (0.000 000 000 49)
+.Ss proton relative atomic mass
+1.007 276 466 621 (0.000 000 000 053)
+.Ss proton rms charge radius
+8.414 e-16 (m) (0.019 e-16)
+.Ss proton-tau mass ratio
+0.528 051 (0.000 036)
+.Ss quantum of circulation
+3.636 947 5516 e-4 (m^2 s^-1) (0.000 000 0011 e-4)
+.Ss quantum of circulation times 2
+7.273 895 1032 e-4 (m^2 s^-1) (0.000 000 0022 e-4)
+.Ss reduced Compton wavelength
+3.861 592 6796 e-13 (m) (0.000 000 0012 e-13)
+.Ss reduced muon Compton wavelength
+1.867 594 306 e-15 (m) (0.000 000 042 e-15)
+.Ss reduced neutron Compton wavelength
+2.100 194 1552 e-16 (m) (0.000 000 0012 e-16)
+.Ss reduced Planck constant
+1.054 571 817... e-34 (J s) (exact)
+.Ss reduced Planck constant in eV s
+6.582 119 569... e-16 (eV s) (exact)
+.Ss reduced Planck constant times c in MeV fm
+197.326 980 4... (MeV fm) (exact)
+.Ss reduced proton Compton wavelength
+2.103 089 103 36 e-16 (m) (0.000 000 000 64 e-16)
+.Ss reduced tau Compton wavelength
+1.110 538 e-16 (m) (0.000 075 e-16)
+.Ss Rydberg constant
+10 973 731.568 160 (m^-1) (0.000 021)
+.Ss Rydberg constant times c in Hz
+3.289 841 960 2508 e15 (Hz) (0.000 000 000 0064 e15)
+.Ss Rydberg constant times hc in eV
+13.605 693 122 994 (eV) (0.000 000 000 026)
+.Ss Rydberg constant times hc in J
+2.179 872 361 1035 e-18 (J) (0.000 000 000 0042 e-18)
+.Ss Sackur-Tetrode constant (1 K, 100 kPa)
+-1.151 707 537 06 (0.000 000 000 45)
+.Ss Sackur-Tetrode constant (1 K, 101.325 kPa)
+-1.164 870 523 58 (0.000 000 000 45)
+.Ss second radiation constant
+1.438 776 877... e-2 (m K) (exact)
+.Ss shielded helion gyromag. ratio
+2.037 894 569 e8 (s^-1 T^-1) (0.000 000 024 e8)
+.Ss shielded helion gyromag. ratio in MHz/T
+32.434 099 42 (MHz T^-1) (0.000 000 38)
+.Ss shielded helion mag. mom.
+-1.074 553 090 e-26 (J T^-1) (0.000 000 013 e-26)
+.Ss shielded helion mag. mom. to Bohr magneton ratio
+-1.158 671 471 e-3 (0.000 000 014 e-3)
+.Ss shielded helion mag. mom. to nuclear magneton ratio
+-2.127 497 719 (0.000 000 025)
+.Ss shielded helion to proton mag. mom. ratio
+-0.761 766 5618 (0.000 000 0089)
+.Ss shielded helion to shielded proton mag. mom. ratio
+-0.761 786 1313 (0.000 000 0033)
+.Ss shielded proton gyromag. ratio
+2.675 153 151 e8 (s^-1 T^-1) (0.000 000 029 e8)
+.Ss shielded proton gyromag. ratio in MHz/T
+42.576 384 74 (MHz T^-1) (0.000 000 46)
+.Ss shielded proton mag. mom.
+1.410 570 560 e-26 (J T^-1) (0.000 000 015 e-26)
+.Ss shielded proton mag. mom. to Bohr magneton ratio
+1.520 993 128 e-3 (0.000 000 017 e-3)
+.Ss shielded proton mag. mom. to nuclear magneton ratio
+2.792 775 599 (0.000 000 030)
+.Ss shielding difference of d and p in HD
+2.0200 e-8 (0.0020 e-8)
+.Ss shielding difference of t and p in HT
+2.4140 e-8 (0.0020 e-8)
+.Ss speed of light in vacuum
+299 792 458 (m s^-1) (exact)
+.Ss standard acceleration of gravity
+9.806 65 (m s^-2) (exact)
+.Ss standard atmosphere
+101 325 (Pa) (exact)
+.Ss standard-state pressure
+100 000 (Pa) (exact)
+.Ss Stefan-Boltzmann constant
+5.670 374 419... e-8 (W m^-2 K^-4) (exact)
+.Ss tau Compton wavelength
+6.977 71 e-16 (m) (0.000 47 e-16)
+.Ss tau-electron mass ratio
+3477.23 (0.23)
+.Ss tau energy equivalent
+1776.86 (MeV) (0.12)
+.Ss tau mass
+3.167 54 e-27 (kg) (0.000 21 e-27)
+.Ss tau mass energy equivalent
+2.846 84 e-10 (J) (0.000 19 e-10)
+.Ss tau mass in u
+1.907 54 (u) (0.000 13)
+.Ss tau molar mass
+1.907 54 e-3 (kg mol^-1) (0.000 13 e-3)
+.Ss tau-muon mass ratio
+16.8170 (0.0011)
+.Ss tau-neutron mass ratio
+1.891 15 (0.000 13)
+.Ss tau-proton mass ratio
+1.893 76 (0.000 13)
+.Ss Thomson cross section
+6.652 458 7321 e-29 (m^2) (0.000 000 0060 e-29)
+.Ss triton-electron mass ratio
+5496.921 535 73 (0.000 000 27)
+.Ss triton g factor
+5.957 924 931 (0.000 000 012)
+.Ss triton mag. mom.
+1.504 609 5202 e-26 (J T^-1) (0.000 000 0030 e-26)
+.Ss triton mag. mom. to Bohr magneton ratio
+1.622 393 6651 e-3 (0.000 000 0032 e-3)
+.Ss triton mag. mom. to nuclear magneton ratio
+2.978 962 4656 (0.000 000 0059)
+.Ss triton mass
+5.007 356 7446 e-27 (kg) (0.000 000 0015 e-27)
+.Ss triton mass energy equivalent
+4.500 387 8060 e-10 (J) (0.000 000 0014 e-10)
+.Ss triton mass energy equivalent in MeV
+2808.921 132 98 (MeV) (0.000 000 85)
+.Ss triton mass in u
+3.015 500 716 21 (u) (0.000 000 000 12)
+.Ss triton molar mass
+3.015 500 715 17 e-3 (kg mol^-1) (0.000 000 000 92 e-3)
+.Ss triton-proton mass ratio
+2.993 717 034 14 (0.000 000 000 15)
+.Ss triton relative atomic mass
+3.015 500 716 21 (0.000 000 000 12)
+.Ss triton to proton mag. mom. ratio
+1.066 639 9191 (0.000 000 0021)
+.Ss unified atomic mass unit
+1.660 539 066 60 e-27 (kg) (0.000 000 000 50 e-27)
+.Ss vacuum electric permittivity
+8.854 187 8128 e-12 (F m^-1) (0.000 000 0013 e-12)
+.Ss vacuum mag. permeability
+1.256 637 062 12 e-6 (N A^-2) (0.000 000 000 19 e-6)
+.Ss von Klitzing constant
+25 812.807 45... (ohm) (exact)
+.Ss weak mixing angle
+0.222 90 (0.000 30)
+.Ss Wien frequency displacement law constant
+5.878 925 757... e10 (Hz K^-1) (exact)
+.Ss Wien wavelength displacement law constant
+2.897 771 955... e-3 (m K) (exact)
+.Ss W to Z mass ratio
+0.881 53 (0.000 17)
+
+.Sh INFO
+Manual page version 2018-1. Public domain.
+
+Generated from
+.Lk https://physics.nist.gov/cuu/Constants/Table/allascii.txt
+using the following script for the table:
+.Bd -literal -offset indent -compact
+awk -F '  +' 'NR >= 12 {
+if ($4 != "")
+	$4 = " (" $4 ")";
+if ($1 == "")
+	next;
+if ($3 !~ /^\(/)
+	$3 = "(" $3 ")"
+printf(".Ss %s\n%s%s %s\n", $1, $2, $4, $3)
+} ' allascii.txt
+.Ed
diff --git a/elements.7 b/elements.7
new file mode 100644
index 0000000..83a423a
--- /dev/null
+++ b/elements.7
@@ -0,0 +1,49 @@
+.Dd $Mdocdate: April 2 2022 $
+.Dt elements 7
+.Os
+.Sh NAME
+.Nm elements
+.Nd Periodic Table of the Elements
+.Sh TABLE
+.TS
+allbox:tab(:);
+c:c:c:c:c:c:c:c.
+Group:1:2:3:4:5:6:7
+1:₁H:₃Li:₁₁Na:₁₉K:₃₇Rb:₅₅Cs:₈₇Fr
+2::₄Be:₁₂Mg:₂₀Ca:₃₈Sr:₅₆Ba:₈₈Ra
+3::::₂₁Sc:₃₉Y:₅₇La:₈₉Ac
+=::::::₅₈Ce:₉₀Th
+=::::::₅₉Pr:₉₁Pa
+=::::::₆₀Nd:₉₂U
+=::::::₆₁Pm:₉₃Np
+=::::::₆₂Sm:₉₄Pu
+=::::::₆₃Eu:₉₅Am
+=::::::₆₄Gd:₉₆Cm
+=::::::₆₅Tb:₉₇Bk
+=::::::₆₆Dy:₉₈Cf
+=::::::₆₇Ho:₉₉Es
+=::::::₆₈Er:₁₀₀Fm
+=::::::₆₉Tm:₁₀₁Md
+=::::::₇₀Yb:₁₀₂No
+=::::::₇₁Lu:₁₀₃Lr
+4::::₂₂Ti:₄₀Zr:₇₂Hf:₁₀₄Rf
+5::::₂₃V:₄₁Nb:₇₃Ta:₁₀₅Db
+6::::₂₄Cr:₄₂Mo:₇₄W:₁₀₆Sg
+7::::₂₅Mn:₄₃Tc:₇₅Re:₁₀₇Bh
+8::::₂₆Fe:₄₄Ru:₇₆Os:₁₀₈Hs
+9::::₂₇Co:₄₅Rh:₇₇Ir:₁₀₉Mt
+10::::₂₈Ni:₄₆Pd:₇₈Pt:₁₁₀Ds
+11::::₂₉Cu:₄₇Ag:₇₉Au:₁₁₁Rg
+12::::₃₀Zn:₄₈Cd:₈₀Hg:₁₁₂Cn
+13::₅B:₁₃Al:₃₁Ga:₄₉In:₈₁Tl:₁₁₃Nh
+14::₆C:₁₄Si:₃₂Ge:₅₀Sn:₈₂Pb:₁₁₄Fl
+15::₇N:₁₅P:₃₃As:₅₁Sb:₈₃Bi:₁₁₅Mc
+16::₈O:₁₆S:₃₄Se:₅₂Te:₈₄Po:₁₁₆Lv
+17::₉F:₁₇Cl:₃₅Br:₅₃I:₈₅At:₁₁₇Ts
+18:₂He:₁₀Ne:₁₈Ar:₃₆Kr:₅₄Xe:₈₆Rn:₁₁₈Og
+.TE
+.Sh INFO
+This file is public domain. Manual page version 1.0.
+
+This periodic table is rotated sideways because the standard terminal
+is too narrow.
diff --git a/si.7 b/si.7
new file mode 100644
index 0000000..a37e07f
--- /dev/null
+++ b/si.7
@@ -0,0 +1,193 @@
+.Dd $Mdocdate: April 2 2022  $
+.Dt SI 7
+.Os
+.Sh NAME
+.Nm SI
+.Nd The International System of Units
+.Sh SOURCE
+NIST SP 330,
+.Em The International System of Units (SI) ,
+2019 edition,
+.Lk https://doi.org/10.6028/NIST.SP.330-2019 .
+Some data from the
+.Sx NOT-ACCEPTABLE NON-SI UNITS STILL IN USE
+section are from NIST SP 811,
+.Em NIST Guide for the Use of the International System of Units (SI) ,
+2008,
+.Lk https://www.nist.gov/pml/special-publication-811 .
+.Sh PREFIXES
+.TS
+allbox tab( );
+c | c | c || c | c | c
+l c r || l c r.
+Name Prefix Power Name Prefix Power
+yotta Y 24 yocto y -24
+zetta Z 21 zepto z -21
+exa E 18 atto a -18
+peta P 15 femto f -15
+tera T 12 pico p -12
+giga G 9 nano n -9
+mega M 6 micro \(mc -6
+kilo k 3 milli m -3
+hecto h 2 centi c -2
+deka da 1 deci d -1
+.TE
+.Sh BASE UNITS
+.TS
+allbox;
+r | l | c | c
+r l c c.
+Quantity	Unit	Symbol	Dimension
+time	second	s	T
+length	meter	m	L
+kilogram	mass	m	M
+current	ampere	A	I
+temperature	kelvin	K	\(*H
+luminosity	candela	cd	J
+Unitless	=	1	=
+.TE
+Unitless quantities (like indices of refraction) are usually written
+with no symbol at all, or with a conventional symbol, like
+.Dq rad
+(see below).
+.Sh DERIVED UNITS
+.TS
+allbox;
+r | l | c | c | c
+l l c c c.
+Quantity	Unit	Symbol	Base Units	Equivalent
+plane angle	radian	rad	m/m	1
+solid angle	steradian	sr	m\(S2/m\(S2	1
+frequency	hertz	Hz	s⁻¹	=
+force	newton	N	kg m s⁻²	=
+T{
+pressure, stress
+T}	pascal	Pa	kg m⁻¹ s⁻²	N m⁻²
+T{
+energy, work, heat
+T}	joule	J	kg m² s⁻²	N m
+T{
+power, radiant flux
+T}	watt	W	kg m² s⁻³	J/s
+T{
+electric potential difference
+T}	volt	V	kg m² s⁻³ A⁻¹	W/A
+charge	columb	C	A s	=
+capacitance	farad	F	kg⁻¹ m⁻² s⁴ A²	C/V
+resistance	ohm	\(*W	kg m² s⁻³ A⁻²	V/A
+conductance	siemens	S	kg⁻¹ m⁻² s³ A²	A/V
+T{
+magnetic flux
+T}	weber	Wb	kg m² s⁻² A⁻¹	V s
+T{
+magnetic flux density
+T}	tesla	T	kg s⁻² A⁻¹	Wb m⁻²
+inductance	henry	H	kg m² s⁻² A⁻²	Wb/A
+T{
+temperature, celsius
+T}	celsius	\(de C	K + 273.15	=
+T{
+luminous flux
+T}	lumen	lm	cd sr	=
+T{
+illuminance
+T}	lux	cd sr m⁻²	lm m⁻²
+T{
+activity referred to a
+radionuclide
+T}	becquerel	Bq	s⁻¹	=
+T{
+absorbed dose, kerma
+T}	gray	m² s⁻²	J/kg
+T{
+dose equivalent
+T}	sievert	Sv	m² s⁻²	J/kg
+T{
+catalytic activity
+T}	katal	kat	mol s⁻¹	=
+.TE
+The equivalent units for pressure do not appear in the source.
+.Sh SAMPLE OF OTHER DERIVED UNITS
+.TS
+allbox;
+l r r.
+Quantity	Units	Base
+dynamic viscosity	Pa s	kg m⁻¹ s⁻¹
+surface tension	N m	kg m² s⁻²
+T{
+angular velocity, angular frequency
+T}	rad s⁻¹	s⁻¹
+T{
+heat flux density, irradiance
+T}	W m⁻²	kg s⁻³
+T{
+heat capacity, entropy
+T}	J K⁻¹	kg m² s⁻² K⁻¹
+T{
+specific heat capacity, specific entropy
+T}	J K⁻¹ kg⁻¹	m² s⁻² K⁻¹
+T{
+thermal conductivity
+T}	W m⁻¹ K⁻¹	kg m s⁻³ K⁻¹
+T{
+electric field strength
+T}	V m⁻¹	kg m⁻¹ s⁻³ A⁻¹
+permittivity	F m⁻¹	kg⁻¹ m⁻³ s⁴ A²
+permeability	H m⁻¹	kg m s⁻² A⁻²
+T{
+radiant intensity
+T}	W sr⁻¹	kg m² s⁻³
+radiance	W sr⁻¹ m⁻²	kg s⁻³
+.TE
+The source gives more examples.
+.Sh NON-SI UNITS ACCEPTED FOR USE IN SI
+.TS
+allbox;
+l l c r.
+Quantity	Name	Sym.	Value
+time	minute	min	1 min = 60 s
+\^	hour	h	1 h = 60 min = 3600 s
+\^	day	d	1 d = 24 h = 86400 s
+length	T{
+astronomical unit
+T}	au	T{
+1 au = 149 597 870 700 m
+T}
+angle	degree	\(de	1\(de = (\(*p/180) rad
+\^	minute	\(fm	T{
+1\(fm = (1/60)\(de = (\(*p/10 800) rad
+T}
+\^	second	\(sd	T{
+1\(sd = (1/60)\(de = (\(*p/648 000) rad
+T}
+area	hectare	ha	1 ha = 1 hm² = 10⁴ m²
+volume	liter	L	1 L = 1 dm³ = 10³ cm³ = 10⁻³ m³
+mass	metric ton	t	1 t = 10³ kg
+\^	dalton	Da	1 Da = 1.660 539 040 (20) E-27 kg
+energy	electronvolt	eV	1 eV = 1.602 176 634 e-19 J
+T{
+logarithmic quantities
+T}	neper	Np	natural log
+\^	bel	B	base-10 log
+\^	decibel	dB	1 dB = 10⁻¹ B
+.TE
+.Sh NOT-ACCEPTABLE NON-SI UNITS STILL IN USE
+.TS
+allbox;
+l l c r.
+Quantity	Name	Sym.	Value
+length	ångström	\(oA	10⁻¹⁰ m
+\^	micron	\(*m	1 \(*mm
+\^	parsec	pc	1 pc = 3.085 678E+16 m
+T{
+radiation dose
+T}	rad	rad OR rd	1 rd = 10⁻² Gy
+pressure	T{
+millimeter of mercury
+T}	mmHg	1 mmHg \(=~ 133.322 Pa
+T{
+magnetic flux density
+T}	gauss	G OR Gs	1 G = 100 μT
+.TE
+.Sh INFO
+This file is public domain. Manual page version 1.0.