# Questions about the Point Function (Thermodynamics)

#### Rahulx084

We know from first law of thermodynamics for a closed system that $dE$=$\delta Q$ -$\delta W$ , my question is that for a closed adiabatic system net heat transfer =0 this mean net change in energy = work done , does that mean for an adiabatic system work done is a point function as energy is a point function? If yes , we know that for a constant volume process heat transfer is equal to change in internal energy,does that mean for every constant pressure process for a closed system heat transfer is a point function?

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#### Chestermiller

Mentor
A point function is, by definition, an entity that is independent of path, and depends only on the two end points. So fixing the path and asking whether something is a point function doesn't make a whole lot of sense (to me).

#### Rahulx084

That means for any process irrespective of its nature work is always going to be path function, Right?

#### Chestermiller

Mentor
That means for any process irrespective of its nature work is always going to be path function, Right?
It means that, for any two end states, work is always going to be a path function.

"Questions about the Point Function (Thermodynamics)"

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