When liquid nitrogen is placed in a sealed container, the pressure of the container increases until the container explodes. The energy released in the explosion can be used to launch a bucket high into the air. Analyzing the experiment using the ideal gas law gives results that are inconsistent with observations. Use of the van der Waals equation yields reasonable results.
This demonstration shows the construction of of an eleven foot high barometer made with a concentrated solution of potassium tetraiodomercurate(II).
When water is squeezed into an inverted flask containing ammonia, the ammonia dissolves in the water and the reduced pressure causes a fountain effect.
The relationship between the volume of a gas and the pressure it exerts, known as Boyle's Law, is shown with a J-tube.
Comparing the densities of mercury, potassium tetraiodomercurate(II) solution, and water illustrates that barometers made from the three liquids have different heights.