Time

1 h = 3600 s

Length

1 in. = 2.540 cm

1 ft = 12 in.

1 mile = 5280 ft

Mass

1 lbm = 0.45359 kg

1 slug = 32.174 lbm

Force

1 lbf = 32.174 lbm-ft/s ²

1 N = 1 kg-m/s ²

Energy

1 Btu = 778.16 ft-lbf

1 J = 1 N-m

Power

1 hp = 550 ft-lbf/s

1 W = 1 J/s

Pressure

1 atm = 14.696 lbf/in. ² = 2116.2 lbf/ft ²

1 Pa = 1 N/m ²

Temperature

The Farenheit scale is T( F) = 1.8 T( C) + 32 where T( C) is the International Celsius scale.

The Rankine scale is

• T( R) = T( F) + 459.69;

• T( R) = 1.8 { T( C) + 273.16};

• T( R) = 1.8 T(K)

• where T(K) is the Kelvin scale.

Acceleration of standard gravity

g ₀ = 9.8067 m/s ² = 32.174 ft/s ²

Newton constant

g _c = ma/ F = 32.174 lbm-ft/(lbf-s ²) for British Engineering

g _c = 1 for SI

10 ⁶

mega

M

megawatt (MW)

10 ³

kilo

k

kilometer (km)

10 ^-2

centi

c

centimeter (cm)

10 ^-3

milli

m

milliwatt (mW)