Graham's Law of Effusion
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
A gas's rate of effusion is inversely proportional to the square root of its molar mass.
Show
Helium, far lighter than oxygen, effuses through a pinhole several times faster than oxygen does under identical conditions.
Watch for
The ratio of effusion rates scales with the square root of the inverse molar-mass ratio, not with molar mass directly.