# Physics GRE GR 1777 Problem 008

## 008. Thermodynamics (Laws of thermodynamics)

$dQ = de + PdV$

where $Q$ is the amount of heat, $e$ is the internal energy, $P$ is the pressure, and $V$ is the volume of the system.

### Solution

If we want to make a process that the increase in the internal energy is equal to the heat supplied, we should get rid of the second term of the above equation. That means, $dV$ should be zero.
The process that the $dV$ equals zero is called the constant volume process, therefore the answer is (B).