For Homeschool Resources Visit Teach-At-Home
Search for 
Home | Legal | About Us | Link To Us | Bookmark Us | Recommend Us | Suggest a Link | Search | Feedback | Contact
space



Homeschool Fast Facts!
-Physical Constants-

<< Fact Home Teach-at-Home
 
The following short list of constants is from the Massachusetts Institute of Technology. The authoritative source for all constants is at the United States National Institute of Standards and Technology (NIST).  Please visit NIST Constants for a more detailed and categorized list of constants.

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 = 1.60217733e19 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
Electrical
  • Primitivity 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
Nuclear
  • 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
Chemistry/Thermo
  • 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
  • Molar volume
    • 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
Pressures
  • Standard pressure (1 atm) 1.01325e5 Pa (Newton/m**2)
  • 1 Torr = 1 mm Hg = 133.3 N/m**2 = 133.3 Pa
  • 1 psi = 6.89e3 Pa
Radioactivity
  • 1 Curie 3.7e10 counts/s
Astronomical Units
  • Solar Mass 1.989e33 g
  • Solar Radius 6.9599e10 cm
  • Solar luminosity 3.826e33 ergs/s
  • Gravity at solar surface 2.74e4 cm/s**2
  • Earth mass 5.976e27 g
  • 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 magnitude -26.73
  • 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
  • parsec 3.085678e18 cm
  • light year 9.460530e17 cm
  • Xu 1.00208e-11 cm
  • flux unit = Jansky = 1e-26 W/m**2/Hz
  • Hubble constant 100 km/s/Mpc
Optical Constants
  • 1 candle = 1 lumen/steradian
  • 1 candle/m**2 = 3.142e-4 lambert
  • 1 lambert = 2.054 candles/in**2
  • 1 lux = 1 meter-candle
  • 1 lux = .0929 foot-candle
  • 1 lumen = 1 candle into an angle of 1 steradian
  • 1 lumen = .001495 watts of light at 546 nm
 
Please visit NIST Constants to see the complete list of constants.

** Teach-At-Home: Your Homeschool Resource Center **
Please E-Mail your comments or suggestions.
Hi!
 ICRA Teach-At-Home is listed as a family-friendly and child-safe web site by the Internet Content Rating Association Labelled
2000-2008 Teach-At-Home, Inc.
Teach-At-Home Inc. has no liability for any content or goods on the
Teach-At-Home site or the Internet, except as set forth in the Site Terms of Use.
Site Terms of Use |  Advertise |  FAQ |  Privacy