# How do you convert 20.0 atm to torr?

$\text{Torr}$ or $\text{mm Hg}$ are a very convenient measurement to use ON EARTH. $1$ $\text{atmosphere}$ of pressure will support a column of mercury $\text{760 mm}$ high. This is a very visual and very convenient way to measure atmospheric pressure in a laboratory. Of course on Venus (which has a much thicker atmosphere), the atmosphere would probably support a much longer column.
So if you were on such a Planet, your mercury column would be $20.0 \cdot a t m \times 760 \text{ mm Hg}$.