Length

• 1m = 39.37 inch = 10 ⁶ ?m = ¹⁰ A

• 1 inch = 2.54 cm

• 1ft = 30.48 cm = 0.3048 m

• 1 mile = 5280 ft = 1760 yds = 1609.344 m

Energy

• 1J = 1W.s = 1kgm ²/s

• 1 N.m ³

• = 10 ⁷ dyne.cm = 10 ⁷erg

• 1 Btu = 778 ft.lbf = 252 cal

• = 1055 J = 10.41 lit.atm

• 1 HP.hr = 2545 Btu

• 1 kW.hr = 3412 Btu

• = 1.341 HP.hr

Power

• 1HP = 550 ft.lbf/s

• = 33000 ft. lbf/min

• = 746 W = 0.746 kW

Gas Constant

• R = 1.9859 Btu/lbmole R

• = 1.9859cal/grmole. K

• = 0.73024 atm ft ³/lbmole. R

• = 1545.3 ft.lbf/lbmole. R

• = 10.732 psia.ft ³/lbmole. R

• = 0.082057 lit. atm/grmole. K

• = 82.057 atm. Cm ³/kgmole. K or J/kg mole. K

• = 8.3145 kJ/kg mole. K

Mass

• 1 lbm = 453.6 gr = 0.4536 kg

• = 7000 grain

• 1kg = 1000 gr = 2.2046 lbm

• 1 slug = 1 lbf s ²/ft = 32.174 lbm

• 1US ton = 2000 lbm (also called short ton)

• 1 long ton = 2240 lbm (also called British ton)

• 1 tonne = 1000 kg (also called metric ton)

Force

• 1 lbf = 4.448 N = 4.448 10 ⁵ dynes = 32.174 poundals

• = 32.174 lbm.ft/s ²

• = 1 lbw

Pressure

• 1 atm = 14.696 psia

• = 2116 lbf/ft ²

• = 29.92 in Hg = 760 mm

• Hg = 760 Torr.

• = 1.013 bar

• = 33.9...