What Is Joule's Constant?

Joule’s constant expresses that 4,186 joules of work spent can consistently generate the same amount of heat that can increase the temperature of 1 kilogram of water by 33.8 degrees Fahrenheit. A relationship established between the work done and the heat generated was a constant quantity called Joule’s constant.

Joule’s constant is also called the mechanical equivalent of heat. If mechanical work is done against the frictional forces, energy is released in the form of heat. The rise in temperature of water by 1 degree Celsius or 33.8 degrees Fahrenheit, due to the work done, is also described as the heat capacity of water. Joule’s equivalent is determined by measuring the work done and heat dissipated.

The Joule’s equivalent or constant is, J = ?W/?H joule/calorie.