Ammonia fountain

The experiment consists of introducing water through an inlet to a container filled with ammonia gas.

[1] Ammonia dissolves into the water and the pressure in the container drops.

As a result, more water is forced into the container from another inlet creating a fountain effect.

The demonstration introduces concepts like solubility and the gas laws at entry level.

A different gas of comparable solubility in water, such as hydrogen chloride, can be used instead of ammonia.