Physics Constants

NAME SYMBOL VALUE

Constant, Wien Displacement Law b 2.8977686(51) × 10^-3 m K

Constants, Planck (h/2π) ħ
(h bar) 1.054571596(82) × 10^-34 J s
6.58211889(26) × 10^-16 eV s

Constants, Rydberg α²m_ec/2h R_∞
R_∞c
R_∞hc 10973731.568549(83) m^-1
3.289841960368(25) × 10¹⁵ Hz
2.17987190(17) × 10^-18 J

Cross Section, Thomson σ_e 0.665245854(15) × 10^-28 m²

Dalton amu
m_u
u 1.66053873(13) × 10^-27 kg
931.494013(37) MeV
1.49241778(12) × 10^-10 J

Daniel Cell, emf of 1.08 V

Density, Earth's Average 5.517 × 10³ kg m^-3

Deuteron Magnetic Moment µ_d 0.43307375(15) × 10^-26 J T^-1
0.4669754479 × 10^-3 µ_B
0.857438230(24) µ_N

Deuteron Molar Mass M_d 2.013553214(24) u

Deuteron Rest Mass m_d 3.3435860(20) × 10^-27 kg
2.013553214(24) u
1875.61339(57) MeV c^-2