The heat always flows from a hotter place to a cooler place.
Spontaneous heat transfer occurs from a high temperature to a low temperature, as explained by the second law of thermodynamics.
The Kelvin-Planck formulation or the second law of thermodynamics states that it is not possible to make a heat engine that works in a cycle that merely converts the heat energy obtained from a reservoir at a certain temperature entirely into mechanical effort. The second law of thermodynamics says that heat flow has a direction; in other words, not all processes in the universe are reversible. For example, if a polar bear sleeps in the snow, the snow under its body will melt because of the heat from the bear's body. However, the bear cannot take the heat from the snow to warm the body. Thus, the heat energy flow has a direction, from hot to cold. One important application of the second law is the study of heat engines.
Conduction or diffusion
Energy transfer between objects that are in physical contact with a source of heat.
Convection
The transfer of energy between an object and its environment is due to the movement of fluids originating from heat sources.
Advection
Energy transfer from one location to another as a side effect of energy moving objects.
Radiation
Energy transfer from or to an object due to the release or absorption of electromagnetic radiation and does not have to make physical contact with sources of heat.
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Details
Class: high school
Subject: Chemistry
Keywords: displacement, heat, thermodynamics
