![]() The third law of thermodynamics can be stated as:Ī system's entropy approaches a constant value as its temperature approaches absolute zero. Natural processes tend to go only one way, toward less usable energy and more disorder. It states that, in an isolated system, entropy can increase but cannot decrease. ![]() The second law of thermodynamics says that some things can't be undone after they are done. The energy gained (or lost) by a system is equal to the energy lost (or gained) by its surroundings. It can also be stated in the following form: ![]() The law of conservation of energy states that the total energy of an isolated system is constant energy can be transformed from one form to another, but can be neither created nor destroyed. The first law of thermodynamics is a version of the law of conservation of energy, adapted for thermodynamic systems. The entropy change of a closed system is equal to the heat added reversibly to it divided by the absolute temperature of the system, i.e. If two systems are both in thermal equilibrium with a third system, then they are in thermal equilibrium with each other. The second law of thermodynamics introduces a new property called entropy, S, which is an extensive property of a system. It says the transitive relationship between the temperatures of multiple bodies in thermal equilibrium. The zeroth law of thermodynamics says temperature is an empirical parameter in thermodynamic systems.
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