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you need really simple materials to do this experiment. you need some milk, incense stick,
a dropper and a fish tank full of water. now just let go a drop of milk in a glass of water
and watch its formation. a high density drop in a low density fluid is called Rayleigh-
Taylor instability and the drop forms a kind of a mushroom cloud or a vortex. here you
can see the mushroom cloud.. now the same thing happens when you light an incense stick.
the smoke which emanates forms a type of a mushroom cloud. now in a big fish tank just
let go a drop of milk from the top. and white drop will form a mushroom cloud like this.
it slowly descends and gradually settles on the base of the fish tank just like a very
amazing mushroom cloud. now let go another drop and this drop makes a vortex. you can
see that the vortex is increasing in diameter and this is called as the Rayleigh- Taylor
instability.