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Why tea kettle sing

What is the reason that the tea kettle sing? Briefly state the reason.

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There is a very small attachment with a hole in it that acts as the whistle. This is inserted to the spout of the kettle and whenever the water begins to boil, the steam produces a sound as it gets away.   

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  • Q : Why tea kettle sing What is the reason

    What is the reason that the tea kettle sing? Briefly state the reason.