Because of the connection between a system's entropy, its ability to do work, and the direction of energy transfer, the 2nd law of thermodynamcis can also be expressed in terms of entropy change. Heat engines are limited in that only some of the energy added as heat can be used to do work. This law applies to the entire universe not only to a system that interacts with its environment.
The second law of thermodynamics states that no cyclic process that converts heat entirely into work is possible. Work can never equal the energy added to engine as heat. Efficiency is a measure of the useful energy taken out of a process relative to the total energy that is put into the process.
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Because of the connection between a system's entropy, its ability to do work, and the direction of energy transfer, the 2nd law of thermodynamcis can also be expressed in terms of entropy change. Heat engines are limited in that only some of the energy added as heat can be used to do work. This law applies to the entire universe not only to a system that interacts with its environment.
Heat engines are measured by their efficiency to do work and not use very much energy. Heat energy is put into an engine and then comes out as energy.
Only some of the energy added as heat can be used as work. Therefore entropy change is similar to the second law of thermodynamics. THE END
The second law of thermodynamics states that no cyclic process that converts heat entirely into work is possible. Work can never equal the energy added to engine as heat. Efficiency is a measure of the useful energy taken out of a process relative to the total energy that is put into the process.
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