which thermodynamics variable is defined by the first law of thermodynamics?
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The thermodynamic variable defined by the zeroth law is temperature.The thermodynamic variable defined by the first law is internal energy.
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The thermodynamic variable that is defined by the first law of thermodynamics is the internal energy of the system.
- The first law of thermodynamics states that the change in internal energy of a system is the sum of heat supplied to the system and work done on the system.
- This gives us the definition of internal energy i.e. the total amount of kinetic and potential energy the molecules of a system possess.
- The heat supplied gives the kinetic energy and the work done gives the potential energy.
- Hence, the internal energy variable is defined in the first law of thermodynamics.
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