by Nikolai Shokhirev
Units of measures | ABC Tutorials | Home
|
National Institute of Standards and Technology http://physics.nist.gov/ |
Quantity |
Notation/definition |
Value |
| Elementary Charge | e | 1.602176462 e-19 [C] |
| Speed of light in vacuum | c | 2.99792458 e+8 [m/s] |
| Planck Constant h | h |
6.62606876 e-34 [J s] = 4.13566727 e-15 [eV s] |
Planck Constant 
|
|
1.054 571 596 e-34 [J s] = 6.58211889 e-16 [eV s] |
| Permittivity constant of vacuum | 
|
8.854187817 e-12 [A s V -1m -1], [ F m -1 ] |
| Permeability constant of vacuum | 
|
1.256637061435917 e-6 [H m -1] = 4π ·10-7 [T m A -1], (exact) [Wb A -1 m -1], [V s A -1 m -1] |
| Proton rest mass | mp | 1.67262158 e-27 [kg] |
| Neutron rest mass | mn | 1.6749286 e-27 kg |
| g-factor (Lande factor) - proton | g | 5.585 694 675 |
| proton magnetic moment | 
|
1.410606633 e-26 [J T -1] |
| Nuclear Magneton - proton |
|
5.05078317 e-27 [J T -1] = 3.152451238 e-8 [eV T -1] = h 7.62259396 [MHz T -1] = h c 2.54262366 e-2 [m-1 T -1] = kB 3.6582638 e-4 [K T -1] |
|
Gyromagnetic ratio - proton (free) - proton (H2O) |
|
2.67522212 e+8 [s-1 T-1] 2.67488853 e+8 1/(s T) 2.67515255 e+8 1/(s T) |
| Gyromagnetic ratio - proton | 
|
42.5774825 [MHz T-1] |
| Electron rest mass | me | 9.10938188 e-31 [kg] |
| Free electron g factor | ge | -2.0023193043737 |
| Bohr magneton | 
|
9.27400899 e-24 [J/T] = 5.788 381749 e-5 [eV T -1] = h 13.99624624 e+9 [Hz T –1] = h c 46.6864521 [m -1 T -1] = kB 0.671 7131 [K T -1] |
| Free electron magnetic moment, | 
|
-9.28476362 e-24[J T-1] |
| Free electron gyromagnetic ratio | 
|
1.760 859794 e+11 [s -1 T -1] |
| Free electron gyromagnetic ratio | 
|
28.0249540 [GHz T -1] |
| Fine structure constant | 
|
7.297352533 e-3 =1/137.03599976 |
| Gravitational constant | G | 6.673 e-11 [N m 2 kg -2 ], [m 3 kg -1 s -2] |
|
Bohr Radius |
|
0.5291772083 e-10 [m] 0.5291772083 [Å] |
| Boltzmann constant | k B |
1.3806503 e-23 [J / K] = 8.617 342 e-5 [eV K –1] = h 2.0836644 e+10 [Hz K-1] = h c 69.50356 [m-1 K -1] |
| Stefan-Boltzmann constant |
|
5.670400 e-8 [W m -2 K -4] |
|
Avogadro's constant (number of molecules in a mole) |
N A | 6.02214199 e+23 [mol -1] |
| Molar Gas Constant | R = NA k B | 8.314472 J mol -1 K -1 |
| Faraday Constant | F = NA e | 96 485.3415 [C mol -1] |
|
Molar Volume, Ideal Gas (at 273.15 K, 101 325 Pa) |
Vm | 22.413 996 e-3 [m 3 mol -1] |
|
Molar Volume, Ideal Gas (at 273.15 K, 100 Pa) |
Vm | 22.710 981 e-3 [m 3 mol -1] |
| Standard Acceleration of Gravity | gn | 9.80665 m s -2 (exact) |
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