# How does the amount of gas in a saturated solution change with pressure?

Sep 3, 2015

The amount of gas in a saturated solution is directly proportional to the pressure.

#### Explanation:

This is known as Henry's Law. It as often written as

$C = k P$,

where $C$ is the concentration of the gas in the solution, $P$ is the partial pressure of the gas, and $k$ is a proportionality constant.

We see this effect in carbonated drinks.

Colas and root beer consist of flavoring and sugars added to a solution of carbon dioxide gas dissolved in water under pressure.

When the pressure is released, the solubility of the gas decreases, and bubbles of carbon dioxide escape from the liquid.

(from www.learner.org)