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to its rate of change of temperature. It accounts for any property that could change the way a material conducts heat. Heat spontaneously flows along a temperature gradient (i.e. from a hotter body to a colder body). For example, heat is conducted from the hotplate of an electric stove to the bottom of a saucepan in contact with it. In the absence of an opposing external driving energy source within a body or between bodies, temperature

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