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Physical Constants and Conversions
Basic - Speed of light in vacuum c = 2.997 924 580 e8 m/s (exact)
- Planck's constant
- h = 6.6260755e-34 J-s
- h = 4.136e-15 eV-s
- hbar = h/2\pi = 1.05457266e-34 J-s
- hbar = 6.57e-16 eV-s
- electron charge q = 1.60217733e-19 coulomb
- Gravitational Constant G 6.7259e-11 N m**2/kg**2
- Boltzmann's constant
- k = 1.380658e-23 J/K
- k = 8.617e-5 eV/K
- Stephan-Boltzmann constant \sigma = 5.67051e-8 W/m**2/K**4
Permittivity of free space \epsilon = 8.854e-12 F/m = 1/c**2\mu \epsilon = 55.3 e/V-micron
Permeability of free space \mu = 4 \pi e-7 H/m or Tesla/ampere Coulomb constant 8.988e9 N-m**2/coul**2 Wavelength of a 1eV photon 1.243e-6 m thermal electron voltage (r.t.) kT/q = 25.86 mv energy of electron (r.t.) kT = .02586 eV energy (1 electron volt) 1 ev = 1.602e-19 J Quantum Hall Resistance 25812.8056 ohms
Electron Rest Mass 9.1093897e-28 g Proton Rest Mass 1.6726231e-24 g Neutron Rest Mass 1.6749286e-24 g Magnetic flux quantum (hc/2e) 2.06783461e-15 Wb Quantum of circulation (h/2m_e) 3.63694807e-4 m**2/s Specific Electron Charge -e/m_e - 1.75881962e11 Coul/kg Electron Magnetic Moment \mu_e 9.2847701e-24 J/T Bohr Magneton 9.2740154e-24 J/Tesla Nuclear Magneton e h-bar/2m_p 5.0507866e-27 J/T Proton Magnetic Moment \mu_p 1.41060761e-26 J/T
Faraday Constant F 9.6485309e4 Coulombs/mole Gas Constant R 8.314510 J/K/mole energy (calories) 1 cal = 4.184 J Bohr radius .529 angstrom Avogadro's number 6.0221367e23 atoms/mole at 273.15K 1e5 Pa 22.71108e-3 m**3/mole at 273.15K 1 atm 22.41410e-3 m**3/mole
atomic mass unit 1.6605402e-24 g
Standard pressure (1 atm) 1.01325e5 Pa (Newton/m**2) 1 Torr = 1 mm Hg = 133.3 N/m**2 = 133.3 Pa
Solar Radius 6.9599e10 cm Solar luminosity 3.826e33 ergs/s Gravity at solar surface 2.74e4 cm/s**2 Earth equatorial radius 6378.164 km Gravity at earth's surface 980.665 cm/s**2 Astronomical Unit 1.4959780e13 cm Solar effective temperature 5800K Solar constant (1976) .1353 W/cm**2 Julian century 36525 ephemeris days Tropical year (1900.0) 365.242 days Tropical year (1900.0) 3.1557e7 ephemeris seconds Ephemeris Day 86400 ephemeris seconds solar motion velocity 19.7 km/s Julian date for 1 Jan 1981: 2444605.5 days parsec 3.261633 light years light year 9.460530e17 cm flux unit = Jansky = 1e-26 W/m**2/Hz Hubble constant 72 km/s/Mpc
1 candle = 1 lumen/steradian 1 candle/m**2 = 3.142e-4 lambert 1 lambert = 2.054 candles/in**2 1 lux = .0929 foot-candle 1 lumen = 1 candle into an angle of 1 steradian 1 lumen = .001495 watts of light at 546 nm
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