Why do water drops dance when poured on a hot plate?

Why do water drops dance when poured on a hot plate?

Ans:
*When a drop of water (at room temp. 30°C)

falls on a hot plate (at a temp. 150 to 200°C)

the water drops begins to 'dance' around the plate because of formation of a layer of steam,
at the interface of the drop and the plate, which acts as a cushion.

**When the drop touches the plate, the bottom layer of water in the drop is suddenly heated to
more than 100°C leading to formation of steam at the interface.

***Steam not being a good conductor of heat, does not
allow the plate's heat to flow easily into the drop.
(inside drop temp. is low)

****At any point of time, the water drop tries to rest on the plate
but the steam holds it up by acting like a cushion.

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