# How would you define Dalton's law of partial pressures and relate it to atmospheric gases?

$\text{Dalton's Law of Partial Pressures}$ states that in a gaseous mixture,...........
$\text{Dalton's Law of Partial Pressures}$ states that in a gaseous mixture, the pressure exerted by a component is the same as the pressure it would exert if it ALONE occupied the container. How did he know? How else but by experiment, and of course the kinetic molecular theory of gases supports Dalton's law. See here and here.