That is, the capacity to move matter or supply heat.
Energy exists in different forms which can be interconverted.
Joule 1 Joule of energy is about the energy needed for 1 heartbeat. Heat is the transfer of thermal energy from one object to another because they are at different temperatures. Heat is a method of energy transfer from a hot object to a cold one. Thermal energy is the energy associated with the random motion of the atoms and or molecules. The Kelvin temperature is related to the constituent particles' average molecular kinetic energy.