Lesson 2, explores the methods by which heat can transfer between different objects or substances. We will be observing and comparing the three methods of heat transfer: conduction, convection, and radiation. Conduction is the transfer of thermal energy between two objects that are in contact with one another. In the case of convection, thermal energy is transferred by a current of gas or liquid. In the final method, radiation, thermal energy transfers through space by electromagnetic waves. In each of these cases, heat will always transfer from the warmer object to a cooler object. Eventually the warm object will become cooler and the cool object will become warmer until their temperatures are balanced. We call this point of balance thermal equilibrium.

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