How does a whistle work?
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Typically whistles involve air streams that flutter against each other. Take the typical whistle where the air rushes straight in and curls around. It has to break through an earlier part of of the air stream to get out the top. This creates an unstable situation, with the air streams fighting for dominance.
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You blow air it squeeze through a hole and makes a small ball present in the whistle to strike the surface of whistle which makes the sound
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