The methods of standardization or calibration employed have much in common even in the cases that appear most diverse.
The joule (/ËdÊuËl/), symbol J, is a derived unit of energy in the International System of Units. It is equal to the energy transferred (or work done) to an object when a force of one newton acts on that object in the direction of its motion through a distance of one metre (1 newton metre or NÂ·m).
Different types of energy are measured by different physical units: Barrels or gallons for petroleum, Cubic feet for natural gas, Tons for coal, and Kilowatt-hours for electricity. A kilowatt is a unit of power equal to 1000 watts.