Reference Tables for Physical Setting/ PHYSICS 2006 Edition
List of Physical Constants
Name Symbol Value
Universal gravitational constant G 6.67× 10–11 N•m2/kg2
Acceleration due to gravity g 9.81 m/s2
Speed of light in a vacuum c 3.00× 108 m/s
Speed of sound in air at STP 3.31× 102 m/s
Mass of Earth 5.98× 1024 kg
Mass of the Moon 7.35× 1022 kg
Mean radius of Earth 6.37× 106 m
Mean radius of the Moon 1.74× 106 m
Mean distance—Earth to the Moon 3.84× 108 m
Mean distance—Earth to the Sun 1.50× 1011 m
Electrostatic constant k 8.99× 109 N•m2/C2
1 elementary charge e 1.60× 10–19 C
1 coulomb (C) 6.25× 1018 elementary charges
1 electronvolt (eV) 1.60× 10–19 J
Planck’s constant h 6.63× 10–34 J•s
1 universal mass unit (u) 9.31× 102 MeV
Rest mass of the electron me 9.11× 10–31 kg
Rest mass of the proton mp 1.67× 10–27 kg
Rest mass of the neutron mn 1.67× 10–27 kg