# Calculation of volume after phase change

1. Aug 5, 2014

### spiri

Folks,

It's been a while since I've done calculations like this so I was wondering if someone can help me calculate the volume of a gas at a specific temperature as compared to its liquid volume when measured below its boiling point. I can't seem to find a phase diagram for this material, is there a way to calculate it?

John

2. Aug 5, 2014

### Staff: Mentor

Assume that the gas is ideal, and use the ideal gas law $PV = N k_\mathrm{B} T$ (or $PV = n R T$) to find the volume. To know $N$ ($n$), you can use the volume of the liquid and its density.