Important Physical constants and units.

1. Physical constants
Mechanics
Light speed, c=2.99792458·10(+8) m/s
Sound speed in air, a=331.46 m/s
Gravitational constant, G=6.6732·10(-11) m(+3)/(kg·s(+2))
Acceleration of gravity, g=9.80665 m/s(+2)
Audibility threshold, P0=0.00002 Pa
Molecular physics
Avogadro's number, Na=6.02217·10(+23) 1/mol
Atomic mass unit, a.m.u.=1.66053·10(-27) kg
Boltzmann's constant, k=1.380622·10(-23) J/K
Loschmidt's number, L0=2.6867·10(+25) m(-3)
Standard gram-molecular volume, V0=22.41 l/mol
Absolute gas constant, R=8.31434 J/(K·mol)
Standard water density, p=999.973 kg/m(+3)
Standard air density, p=1.293 kg/m(+3)
Temperature coefficient of volumetric expansion of gas, b=0.00366 K(-1)
Thompson cross-section, S0=6.65205·10(-29) m(+2)
Electricity and optics
Elementary charge, e=1.60219·10(-19) C
Mass of electron at rest, m=9.10956·10(-31) kg
Mass of proton at rest, Mp=1.6726513·10(-27) kg
Mass of neutron at rest, Mn=1.6749575·10(-27) kg
Mass of muon at rest, Mm=1.883566·10(-28) kg
Ratio, Mp/m=1836.11
Specific charge of electron, e/m=1.76·10(+11) C/kg
Specific charge of proton, e/Mp=0.595·10(+8) C/kg
Permittivity of vacuum, e0=0.885·10(-11) F/m

2. Faraday constant, F=0.9649·10(+5) C/mol
Kerr constant, B=2.2·10(-12) m/V(+2)
Stefan-Boltzmann constant q=5.669·10(-8) W/(m(+2)·K(+4))
Wien's constant, b=0.2897·10(-2) m·K
First radiation constant, C1=3.741832·10(-16) W·m(+2)
Second radiation constant, C2=0.01438786 m·K
Magnetics
Permeability of vacuum, m0=1.257·10(-6) H/m
Magnetic moment of proton, mp=1.4106203·10(-26) J/T
Magnetic moment of electron, me=9.2848·10(-24) J/T
Gyromagnetic ratio for protons, Gp=2.6751965·10(+8) (rad·s)/T
Zeeman displacement per 1Gs, Z=4.66885·10(-3) 1/(m·Gs)
Magnetic quantum flux, F0=2.06785·10(-15) Wb
Rest energy of neutron, En=939.5731 MeV
Rest energy of proton, Ep=938.2796 MeV
Rest energy of electron, Ee=0.5110034 MeV
Atomic and nuclear physics
Rydberg constant, R=2.07·10(+16) 1/s
Rydberg Ry=2.179874·10(-18) J
Planck's constant, h=6.6262·10(-34) J·s
Planck's constant, h^=1.05459·10(-34) J·s
Fine structure constant, a(-1)=137.03597
Bohr magneton, Mb=9.2741·10(-24) J/T
Nuclear magneton, Mn=5.0508·10(-27) J/T
Compton wavelength of electron, Lc=2.426·10(-12) m
Compton wavelength of electron, Lc^=3.86159·10(-13) m
Classical electron radius, r=2.81794·10(-15) m
First Bohr radius, r1=5.29177·10(-11) m
g-factor of electron g/2=1.00115966
Circulation quantum, h*=3.636945·10(-4) (J·s)/kg

3. Josephson relation, 2e/h=4.835939·10(+14) Hz/V
Off-system units
1 year = 3.11·10(+7) s
1 atm = 101.325 kPa
1 bar = 100 kPa
1 mm Hg = 133.3 Pa
1 cal = 4.18 J
1 A` = 10(-10) m
1 a.m.u. = 1.66·10(-27) kg
1 l·atm = 101.3 J
1 eV = 1.60219·10(-19) J
1 un. SGSE = 3.333·10(-10) C
1 erg = 10(-7) J
1 din = 10(-5) N
1 carat = 2·10(-4) kg
1 X (iks) = 10(-13) m
1 light year = 9.463·10(+12) km
1 parsec = 3.08·10(+13) km