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Which of the following statements are TRUE with respect to heat and work? (i) They are boundary phenomena (ii) They are exact differentials (iii) They are path functions 

Which of the following statements are TRUE with respect to heat and work? (i) They are boundary phenomena (ii) They are exact differentials (iii) They are path functions  Correct Answer both (i) and (iii)

Concept:

Both Heat and Work are boundary phenomena. Both are observed only at the boundaries of the system and both represent energy crossing the boundary of the system.

Point function:

  • The thermodynamic properties which depend on the end state only (independent of the path followed) are known as point function like temperature, pressure, density, volume, enthalpy, entropy etc.

Path function: 

  • The thermodynamic properties which depend on the end states, as well as the path followed, are known as path function like heat and work.

 

Only thermodynamic properties are exact differential and properties are point function. As both heat and work are path functions so, they are not thermodynamic properties. So, they are inexact differentials.

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