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For other uses, see Heat
In physics, heat, symbolized by Q, is energy transferred from one body or
system to another due to a difference in temperature. In thermodynamics,
the quantity TdS is used as a representative measure of heat, which is the
absolute temperature of an object multiplied by the differential quantity
of a system's entropy measured at the boundary of the object. Heat can flow
spontaneously from an object with a high temperature to an object with a
lower temperature. The transfer of heat from an object, to another object
with an equal or higher temperature, however, can happen only with the aid
of a heat pump. High temperature bodies, which often result in high rates
of heat transfer, can be created by chemical reactions (such as burning),
nuclear reactions (such as fusion taking place inside the Sun),
electromagnetic dissipation (as in electric stoves), o
