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'''Ammonia fountain''' is a simple type chemical demonstration, used to show the high solubility of certain gases in liquids.

The experiment consists of introducing [[water]] through an inlet to a container filled with [[ammonia]] gas. 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.<ref>https://www.youtube.com/watch?v=gMqRxbv_IW8</ref><ref>https://www.youtube.com/watch?v=hpSdR2SEaXI</ref><ref>https://www.youtube.com/watch?v=NO7V6TMQuBs</ref>

A different gas of comparable solubility in water, such as [[hydrogen chloride]], can be used instead of ammonia.<ref>https://www.youtube.com/watch?v=k8L5AySXviA</ref><ref>https://www.youtube.com/watch?v=ttF0atEChG8</ref>

If the ammonia is replaced by a liquid vapor, such as water vapor, at a pressure higher than its room-temperature vapor pressure, a similar effect is produced. In this case, the reduction in pressure in the container is due to condensation of the vapor as the container cools to room temperature.

==References==
<references/>
===Relevant Sciencemadness threads===

[[Category:Demonstrations]]