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Dinka & Dyno 10/08/09 10 Law Thermodynamics What is thermodynamics? Thermodynamics is the study of the conversion of energy into motion and or heat and its relation to macroscopic variables such as temperature and pressure. In Greek Thermodynamic means Heat and Power. Through out history, thermodynamics develop to increase the efficiency of early steam engines. The zeroth law of thermodynamics is a generalization about the thermal equilibrium among bodies, or thermodynamic systems. It results from the definition and properties of temperature. The first law is the law of conservation of energy in short form is, where dU is the increase in internal energy of the system, δQ is the amount of heat energy added to the system and δW is the amount of work done by the system on its environment. The heat term can cover a large number of processes, including heat added by new particles entering the system. The symbol δ represents the fact that because q and w are not state functions, δq and δw are inexact differentials. The second law shows that in which intensive thermodynamic properties, such as pressure, temperature and others, have a tendency to equalize as time goes or where S is the entropy of the system. The entropy is generally related to the heat term by dS = δQ / T The third law of thermodynamics states that at the absolute zero of temperature, the entropy is at a minimum and all thermodynamic processes cease. The fourth law of thermodynamics is not yet an agreed upon law historically, however, the Onsanger reciprocal relations have been frequently referred to as the fourth law. The applications for thermodynamics make use of the Second Law without directly measuring or considering entropy change in a total isolated system. This approach to the Second Law is widely used in engineering practice, environmental accounting, systems ecology, and other usage.