Conversion Table

one atmosphere (atm) is 101,325 Pa
one calorie (cal) is 4.184 J
one joule (J) is 0.0002390057361 kcal (derived from above)
one joule is (J) 1.439325215 x 10^20 kcal/mole (derived from above)
one kcal/mole is 6.947700141 x 10^-21 J (derived from above)
one Hartree is 627.5095 Kcal/mol is 27.2116 ev is 4.3597482 x 10^-18 J2
one electron volt (ev) is 1.602 177 33 x 10^-19 J1
1,000 kg of crude oil is about 7.3 barrels
one barrel is 158.9873 liters
See also 'Everything Kitchen Conversion Table'

1 kilometer (km) = 1000 meters (m)
1 meter (m) = 100 centimeters (cm)
1 centimeter (cm) = .39 inch (in.)
1 mile (mi) = 5280 feet (ft)
1 foot (ft) = 12 inches (in.)
1 inch (in.) = 2.54 centimeter (cm)
1 square mile (mi2) = 640 acres (a)
1 kilogram (kg) = 1000 grams (g)
1 pound (lb) = 16 ounces (oz)
1 fathom = 6 feet (ft)