# An Elaborate Explanation of the Isothermal Process

What is an isothermal process? What is the work done in such a process? Read to get all the answers.

Omkar Phatak

Last Updated: Jan 23, 2019

Definition

Any thermodynamic process is characterized by a change in the macroscopic thermodynamic variables associated with it. An isothermal process is one in which all developments occur at a constant temperature.

**PV = Constant**

What is the Work Done?

Let us see what is the work done in an isothermal process. For a reversible process, the expression for work done, is given by the following equation:

Here, W

**W**_{iso}= - nRT ln (V_{final}/ V_{initial})Here, W

_{iso}is the work done in an isothermal process, V_{final}is the final volume, and V_{initial}is the initial volume of the system, that undergoes an isothermal change._{final}- V

_{initial}< 0), then according to the given equation, the work done would be positive. That means positive work has been done by the surroundings, on the system.

_{final}- V

_{initial}> 0), the work done is negative. In this case, work is done by the system, to expand.