Constants and Conversions

 

Physical Constants 

average gravity at surface of earth: g = 9.8 m/s2

gravitational constant: G = 6.67x10-11 Nm2/kg2

speed of light: c = 3.00x108 m/s

Avagadro's Number: N = 6.02x1023 atoms/mole

elementary charge: e = 1.60x10-19 C

electron mass: me = 9.11x10-31 kg

proton mass: mp = 1.67x10-27 kg

neutron mass: mn = 1.68x10-27 kg

permittivity of free space: εo = 8.85x10-12 F/m

permeability of free space: µo = 1.26x10-6 H/m

1/(4πεo) = 8.99x109 Nm2/C2

gas constant: R = 8.31 J/mol.K

Plank's constant: h = 6.63x10-34 J/mol.K

Boltzmann constant: k = 1.38x10-23 J/K

average distance from earth to moon: 3.82x108 m

average distance from earth to sun: 1.5x1011 m

mass of earth: 5.98x1024 kg

mass of moon: 7.36x1022 kg

mass of sun: 1.99x1030 kg

radius of earth: 6.37x106 m

radius of moon: 1.74x106 m

radius of sun: 6.96x108 m

 

Conversions 

Length

1 foot = 0.3048 meters

1 mile = 1609 meters

Angles

1 radian = 57.3 degress

Speed

1 m/s = 2.237 miles per hour

1 mile per hour = 1.467 ft/s

Force

1 N = 0.2248 lb

Pressure

1 atm = 760 mm Hg

1 atm = 1.013x105 Pa

1 atm = 14.70 lb/ft2

Energy

1 J = 0.7376 ft.lbs

1 J = 0.2389 cal

1 J = 2.778x10-7 kW.hr

1 J = 2.613x1019 eV

Power

1 W = 1.341x10-3 hp