Correct Answer - Option 4 : Energy transfer is a point function
Explanation:
First Law of Thermodynamics for a closed system undergoing a process neglecting kinetic and potential energy.
δQ = dU + δW
Work done on the system = sign convention is -ve
Work done by the system = sign convention is +ve
Heat or energy transfer to the system = sign convention is +ve
Heat or energy transfer from the system = sign convention is -ve
Path functions:
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Path functions are defined as the thermodynamical variables which depend on the way/path in which the thermodynamical system achieved the initial and final states.
- The differential of path functions is inexact.
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Heat, Energy transfer, work and entropy generation are path functions.
Point functions:
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Point functions are defined as the thermodynamic variable which depends on end states only i.e. initial and final states. They do not depend upon the path followed.
- The differential of point functions is exact.
- Pressure, temperature, volume, entropy, enthalpy etc are point functions.