Cooling the liquid does not cause the water to boil.
Balloons filled with gases less dense than air will rise.
Balloons filled with gases more dense than air will fall.
Carbon dioxide gas is poured down a covered trough with candles inside.
Methane gas from a beaker flows up a covered trough to a candle flame.
Atmospheric pressure causes the collapse of a metal can.
Condensation of water vapor reduces the pressure inside a syringe.
Condensation of water vapor causes atmospheric pressure to crush a can.
The gas effusion apparatus is introduced.
Helium gas effuses through a porous cup, demonstrating the effect of the size and mass of molecules.