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What is sound?
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Sound is a form of energy. Sound is made when something vibrates in air. The vibrations push against the surrounding air molecules, forming a sound wave. First the air molecules are squeezed (this is called compression), then they are stretched (this is called rarefaction). It is easiest to think of sound waves moving in the same way as a wave of energy moves along a coiled spring if one end is repeatedly pushed and pulled.
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Previous:
Back
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Book:
Best Ever Q&A
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Section:
Science & Technology
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Chapter:
Sound
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