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nature : energy conservation and conversion principle in the field of thermodynamics manifestations. Thermodynamics in a closed system (system with the environment without the exchange of material), experienced an arbitrary process, the energy can be used to transform the relationship under-expression : Q = # U-W, the environment passed to the system of heat Q, within the same system (system of internal forms the total energy) increase, U system on the environment and the reactive W sum. The written-# U = Q + W, the energy from the environment into the system to be able to at the same number, and that is energy conservation. This type of expression is the law of the first law of thermodynamics. Practical experience as a summary of this law can also expressed as : a perpetual motion machine (without energy supply and will continue to work for the machine) manufacturers is impossible.
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