gases

Effusion of oxygen

Oxygen gas effuses through a porous cup, demonstrating the effect of the size and mass of molecules.

Effusion of carbon dioxide

Carbon dioxide gas effuses through a porous cup, demonstrating the effect of the size and mass of molecules.

Hydrogen and chlorine cannon

Hydrogen and chlorine gases can be mixed together without reacting, but when the mixture is struck with bright light, it reacts explosively.