Appendix A: Fundamental and Other Physical Constants

APPENDIX A: FUNDAMENTAL CONSTANTS

AND

OTHER PHYSICAL

Quantity

Symbol Value

Uncertainty

Avogadro constant Boltzmann constant Electrical permittivity (vacuum) Electron mass Elementary charge First radiation constant First radiation constant for spectral radiance Magnetic permeability (vacuum) Molar gas constant Planck constant Planck constant over 2p Second radiation constant Second radiation constant (ITS-90) Speed of light in vacuum Stefan2Boltzmann constant Third radiation constant

NA k e0

6.02214179  1023 mol 1 1.3806504  10 23 J/K 8.854187817  10 12 F/m

3.0  1016 mol 1 2.4  10 29 J/K Exact

me e c1 c1L

9.10938215  10 31 kg 1.602176487  10 19 C 3.74177118  10 16 W m2 1.191042759  10 16 W m2/sr

4.5  10 4.0  10 1.9  10 5.9  10

m0

4p  10

R h _ c2 c2

8.314472 J/(mol K) 6.62606896  10 34 J s 1.054571628  10 34 J s 1.4387752  10 2 m K 1.4388  10 2 m K

1.5  10 3.3  10 5.3  10 2.5  10 Exact

c0 s c3

299,792,458 m/s 5.670400  10 8 W/(m2 K4) 2.8977685  10 3 m K

Exact 4.0  10 5.1  10

7

N/A2

38

kg C 23 W m2 24 W m2/sr 27

Exact 5

J/(mol K) Js 42 Js 8 mK 41

13 9

W/(m2 K4) mK

Source: http://physics.nist.gov/cuu/index.html

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