what is meant by rarefaction
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In physics, refraction is the change in direction of a wave passing from one medium to another or from a gradual change in the medium.[1] Refraction of light is the most commonly observed phenomenon, but other waves such as sound waves and water waves also experience refraction. How much a wave is refracted is determined by the change in wave speed and the initial direction of wave propagation relative to the direction of change in the speed.
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Rarefaction is when the particles in a gas become more spread out.
This word can also be applied to sound waves because as it is moving through air it is made up of alternating areas of higher and lower density.
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