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Why is there a hiss sound when water falls on a hot surface? I have searched a lot, asked my teachers but none of them seem to give me the logical answer to it.

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Related: Why is boiling water loud then quiet? –  Chris Mueller Jul 16 at 16:56

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When it turns into a gas it is quickly turning into greater disorder. That sudden transition creates a type of white noise. Within a boiling pot that sound is re-absorbed by the surrounding water so you don't quite hear it the same way.

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Thanks Mark, this is a sort of clear picture but again when there are more degree of freedom less chances are there for disturbance and molecular collisions, actually there are two opposing theories that I have found while researching about it on the net. –  Atif Imran Sep 28 '12 at 18:44

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