Heat transfer is the exchange of thermal energy between physical systems. The rate of heat transfer is dependent on the temperatures of the systems and the . Rate_of_heat_flowCachadLiknandeÖversätt den här sidanThe rate of flow of heat between two systems is measured in watts (joules per second). The transfer of heat is normally from a high temperature object to a lower temperature object. Heat transfer changes the internal energy of both systems involved . In this instance, the transfer of heat from the hot water through the metal can to the cold water is sometimes referred to as conduction. On previous pages of this lesson, we have learned that heat is a form of energy transfer from a high temperature location to a low temperature location.

Without an external agent doing work, heat will always flow from a hotter to a cooler object. Two objects of different temperature always interact. Heat can travel from one place to another in three ways: Conduction, Convection and Radiation.

Both conduction and convection require matter to transfer heat. In the simplest of terms, the discipline of heat transfer is concerned with only two things: temperature, and the flow of heat. Heat transfer takes place as conduction in a soilid if there is a temperature gradient.

Heat flow