back Fundamental Units Table of Units
 Units     Systems Mass   M Length     L Time    T Velocity v = L / T Acceleration a = v / t  =  L / T 2 Force   F = M a Work  W = F s Power  P = W / t Pressure  P = F / A Temp. T Heat Q = Mc(ΔT) Metric Consistent (SI) 1 kg 1 m 1 s 1 m/s 1 m/s2 1kgm/s2 = 1N 1 Newton 1 Nm = 1 J = 1 Joule 1 J/s = 1W   = 1 Watt 1 N/m2 =1 Pa (Pascal) 1 ºC 1 kcalorie (1 kcal) Metric Gravitational 1 kg 1 m 1 s 1 m/s 9.8 m/s2=1g 9.8kgm/s2= 1 kgf = 9.8N 1  kgfm 1 kgfm/s 1 kgf/m2 1 °C 1 kcal American Consistent 1 slug 1 ft 1 s 1 ft/s 1 ft/s2 1 slug ft/s2= 1 lbf 1 lbf ft 1 lbf ft/s 1 lbf/ft2 1 °F 32 Btu American Gravitational 1lbm= (1/32)slug 1 ft 1 s 1 ft/s 32 ft/s2=1g (1/32slug)*32ft/s2 =1 lbf 1 lbf ft 1 lbf ft/s 1 lbf/ft2 1 °F 1 Btu = 1British thermal unit
 Conversions Usual Pressure Units Atmospheric Pressure Density of Water 1 lbm = 0.454 kg lbf / in2  or  (psi) = 1.0 kgf / cm2 = 1 gr/ cm3   =  1 gr / mL 1 ft    = 0.3048 m kgf / cm2 = 1.0 x 105 Pascal =  1000gr / 1000cm3    =  1 kg / L 1 ° F   = (5/9)  °C 106 Pa = MPa = 14.7 psi =  1000kg / 1000L        =  1 ton / m3