# How do you convert 190 mm Hg to kilopascals?

Mar 22, 2016

By conversion to atmospheres then to kilopascals. The answer is approx. $25$ $k P a$

#### Explanation:

$1$ $a t m$ supports a column of mercury $760$ $m m$ high.

$1$ $a t m$ $=$ $101.325$ $k P a$

So (190*cancel"mm Hg")/(760*cancel"mm Hg" cancel(atm^-1) $\times 101.325 \cdot k P a \cdot \cancel{a t {m}^{-} 1}$ $=$ ?? $k P a$.

Even given the safety concerns, the use of mercury manometers in laboratories will continue, as it is a very convenient way to measure pressure. Mind you, if your manometer breaks, and you spill mercury, you're in for a hell of a cleanup job - spilled mercury gets everywhere, at least you can cry over it, and you will.