American usual unit
1 inch = 25.4 mm	1 foot = 0.3048 m	1 yard = 0.9144 m
1 mile = 1.6093 km	1 mph = 0.4470 m/s	1 sq. ft. = 0.0929 sq. m
1 Lb. = 0.4536 kg	1 oz = 28.35 g = 1/16 lb	1 U.S.gallon = 3.7854 Liters
1 psi (lb./inch) = 6895 Pa	1 nautical mile = 1.852 km	1 knot = 0.5144 m/s

Temperature [C = 5/9(F-32)]
Centigrade [Celsius]	Fahrenheit	Kelvin
0 C	32 F	273.15 K
10 C	50 F	283.15 K
20 C	68 F	293.15 K
30 C	86 F	303.15 K
40 C	104 F	313.15 K