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CLOUD TANK Science

A cloud tank consists of a bottom layer of salt water and a top layer of fresh water and when various forms of liquid are injected into tank, clouds are produced.
 
This was the common technique that Hollywood used for decades to capture supernatural weather.
 
When the tempra paint is injected it billows outward like cumulus clouds and will tend to sink a bit.
 
But the salt water prevents it from going lower so the 'cloud' tends to flatten it's base on the salt water line and and billow outward, similar to real clouds based on air pressure levels.
 
Avoid going below into the saltwater since the clouds will just drop to the bottom of tank.
 
Nature is a wonderful demonstrator of fluid dynamics, just look at these supernatual cloud formations.
Mammatus Clouds
Lenticular Clouds
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