# A small quantity of gas is let into a large evacuated chamber. i) How much of the chamber gets filled with the gas? ii) What property of the gas helps it to do so?

$\text{Dalton's Law of Partial Pressures}$ holds that in a gaseous mixture, the partial pressure exerted by a component gas is the same as the pressure it would exert if it alone occupied the container. This is the experimental result: the gas expands to fill the entire chamber.