# What are some common mistakes students make with atmospheric pressure?

$\text{Atmospheres, foot pounds, Pascals, Bar}$ are all used as units of pressure in different parts of the world. As a chemist, usually the most easy, most intuitive unit of pressure to use are $m m$ $H g$, and of course these are units of length not units of pressure.
We know that $1$ $a t m$ will support a column of mercury $760 \cdot m m$ high. So remember $1 \cdot a t m \equiv 760 \cdot m m \cdot H g$.