Common constants

Gravitational constant G ..............6.67x10-11 Nm2 kg-2 Electron charge .............e =.1.60x10-19 C Electron mass .............me =.9.11x10-31 kg Proton mass .............mp =.1.673x10-27 kg Neutron mass .............mn =.1.675x10-27 kg Neutron radius ............rn =.1.3x10-15 m.... Atomic mass unit.............u =.1.661x10-27 kg ... (931.5 MeV) Speed of light .............c =.3.00x108 m s-1 Planck's constant .............h =.6.63x10-34 J s Permetivity of free space.......eo =.8.85x10-12 C2 N-1m-2 Permeability of free space.......mo =.4px10-7 T m A-1 Avagadro's constant...............Na =.6.0223 mol-1 Boltzman's constant...............k =.1.38x10-23 J K-1 Stefan-Boltzman constant..........s =.5.67x10-8 W m2 K-4

Speed of sound in air (Room temp.) ..........340 m s-1 Speed of sound in water .. ..............1500 m s-1 Speed of sound in steel .. ................5200 m s-1 Density of air .. ..............1.26 kg/m-3at STP Density of water .. ..............1000 kg/m-3 Density of ice .. ..............917 kg/m-3 Density of air (STP) .. ..............1.28 kg/m-3 For what the examiner expects you to know ... Click here