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1 inch = 2.54 cm = 25.4 mm
1 foot = 12 inches
1 yard = 3 feet
1 mile = 5,280 feet
1 mile = 1,760 yards
1 mile = 1,609 meters

1 lb = 16 ounces
1 lb = 2.2 kg = 454 gm
1 g = 1,000 mg
1 ton (U.S.) = 2,000 lb
1 tonne (metric ton) = 1,000 kg
1 dram = 1,771.85 mg

1 cm3 = 1 mL
1 in3 = 16.39 cm3
1 ft3 = 1,728 in3
1 ft3 = 0.02832 m3
1 L = 1.057 quarts (U.S.)
1 quart = 0.9463 L
1 U.S. gallon = 0.1337 ft3

1 h = 3,600 sec
1 h = 60 min
1 min = 60 sec

Celsius °C = (°F − 32)/1.8
Kelvin °K = °C + 273
Rankine °R = °F + 460

1 British thermal unit (Btu) = 1 ,055j oules
1 cal = 0.003968 Btu
1 cal = 4.187 J
1 Btu = 252 cal
1 J = 0.2388 cal

1 faraday = 9.65 x 104 coulombs
1g m-calorie=4 .19 joules
1 gm-mole @ 0°C and 1 atm = 22.4 liters
1 gm-mole @ 25 ° C and 1 atm = 24.45 liters
1 ampere-hour = 3,600 coulombs
1 watt = 1 joule/sec = 1 ampere x 1 volt
1 kwh = 3.6 x 106 joules

1 atm = 14.7 psia
= 760mm Hg
= 29.92 in Hg
= 33.90 ft H20
= 101.3 kPa (Kilo Pascal)
= 760 torr
1 bar= 0.9869 atm

1 rad = 10-2 gray
1 rem = 10-2 sievert
1 curie = 3 .7x 1010 becquerel
1 becquerel= 1 disintegration/sec

1 candela = 1 lumen/steradian
1 foot-candle = 10.76 candela/m2 = 10.76 lux

1 tesla = 10,000 gauss

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