Question

In an isobaric process pressure is constant ;means piston is fixed ,so then how, work is done?

Answer 1

Work is done as volume changes.

Explanation:

The work done through an isobaric process is given as the negative area under the pressure vs. volume (PV) curve. Mathematically, this is stated as:

`color(blue)(W=-int_i^fPdV)`

Notice that we are integrating over the pressure with respect to volume. The `dV` indicates an infinitesimal change in volume, and we expect a constant value for the pressure `P`. Hence work is done so long as a pressure exists and there is a change in volume.

A thermodynamic process in which there is no change in volume is an isochoric process. No work is done in an isochoric process.