PX154 - C2 - pV diagrams

from $p V = n R T$ , let's hold $n$ and $T$ constant
$p \propto \frac{1}{V}$ - isotherms (a curve on a diagram joining points representing states of equal temperature)
- [YF fig 18.6]
often used to study systems:
- a piston
  - a "closed system"
for most of this module, we will consider ideal gases