Patterns of problems
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Thermodynamics

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1
Direct use of first law of thermodynamics.
The First Law of Thermodynamics states that heat is a form of energy, and thermodynamic processes are therefore subject to the principle of conservation of energy. This is expressed mathematically as: = , where is the change in the internal energy, is the heat added to the system, and is the work done by the system.
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2
Direct use of second law of thermodynamics.
The second law states that there exists a useful state variable called entropy . The change in entropy is equal to the heat transfer delta divided by the temperature .
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3
Calculation of work.
In thermodynamics, work performed by a system is the energy transferred by the system to its surroundings. Work is a form of energy, but it is energy in transit.
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5
Calculation of heat capacity.
Heat capacity or thermal capacity is a physical property of matter, defined as the amount of heat to be supplied to a given mass of a material to produce a unit change in its temperature.
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6
Problems based on heat engines and cycles.
A heat engine is a system that converts heat or thermal energy to mechanical energy, which can then be used to do mechanical work. It does this by bringing a working substance from a higher state temperature to a lower state temperature.
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