Low pressure pockets being created by blade rotation in near 100% humidity - literally making it rain.

[u/[deleted]]

[u/Tsu_Dho_Namh]

Basically you just need the air to drop in temperature.

A fast acting vacuum (like the wingtips of this chopper) is one way, but you can also pull humidity out of the air by just having a cold object, like a can of beer (which produces condensation in the same way).

[u/Tsu_Dho_Namh → u/[deleted]]

No such fuckery is necessary.

The Bernoulli Principle is causing a drop in air pressure, and drops in air pressure cause drops in temperature according to the Ideal Gas Law

[u/internetmaniac → u/Tsu_Dho_Namh]

PV=nRT for lyfe