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).
Energy can be measured in units called Joules (J). One J = about 1/4 calorie; and one calorie is the amount of energy needed to raise the temperature of 1 gram of water by 1oC (Celsius). FIRST LAW OF THERMODYNAMICS: Energy cannot be created or destroyed; it can only change in form.