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Heat is the feeling through which passes a living against high temperatures. For physics, the heat is the energy that passes a body to another or system to another, a transfer related to the movement of atoms, molecules and particles.
In this sense, the heat can be generated from nuclear reactions (such as mergers taking place inside the Sun), chemical reactions (combustion) or of dissipation. In the latter case, one speaks of electromagnetic dissipation (microwave ovens) or dissipation mechanical (friction).
It is important to mention that the bodies have no heat but rather internal energy. Heat is the transfer of part of this energy (thermal energy) when bodies or systems are at a different temperature. Heat transfer takes place up to this two-body reach a thermal equilibrium, that is, from the moment they reach the same temperature.
The quantity of exchanged thermal energy is measured in calories. This unit of measurement is the amount of energy needed to make a gram of water raises the temperature of 14.5 to 15.5 degrees Celsius. The unit of energy in the International system of units is the joule. One calorie is equal to 4.184 joules.
There are other uses for the term heat, generally having a symbolic or figurative meaning. However, heat can be synonymous with enthusiasm and fervor (for example, "the warmth of the fans was remarkable in the last game") or designate the strongest action ("their clothes themselves are torn in the heat of the fight").