Physics Constants

NAME SYMBOL VALUE

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

Time, Planck l_P/c = (ħG/c⁵)1/2 t_P 5.3906(40) × 10^-44 s

Ton, UK, per 1000yd 1.111 kg m^-1

Ton, UK, per Mile 0.6313 kg m^-1

UK Electrical Power Specification 230V ac, 50Hz

UK Ton per 1000yd 1.111 kg m^-1

UK Ton per Mile 0.6313 kg m^-1

US Electrical Power Specification 115V ac, 60Hz

Volume, Molar (Ideal Gas) (T=273.15 K, p=101.325 kPa) V_m 22.413996(39) × 10^-3 m³ mol^-1

von Klitzing Constant h/e² = µ₀c/2α R_K 25812.807572(95) Ω