![]() ![]() ♦ The zeroth law states that if two bodies are in thermal equilibrium with some third body, then they are also in equilibrium with each other. Since there can be no physical system with lower entropy, all entropy is thus defined to have a positive value. ♦ The third law states that the entropy of a pure crystal at absolute zero is zero. Thus, warm air outside can transfer its energy to a cold room, but transferring energy out of a cold room to the air outside requires extra energy (as with an air conditioner). ♦ The second law states that heat energy cannot be transferred from a body at a lower temperature to a body with a higher one without the addition of energy. The first law is an example of the principle of conservation of energy. ♦ The first law states that the amount of energy added to a system is equal to the sum of its increase in heat energy and the work done on the system. ![]() The branch of physics that deals with the relationships between heat and other forms of energy.
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