Sound waves that are compressed are made of (air) molecules that are more densely concentrated - that is (ie) more molecules are packed into the space of the compressed wave than there are in the (same) space of the surrounding expanded waves.
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In the compression part of a sound wave, molecules are pushed closer together, resulting in higher pressure and density. This compression creates areas of high pressure called compressions.
A sound wave is a compression wave because it consists of alternating areas of high and low pressure. When a sound is produced, it creates a disturbance in the air molecules, causing them to compress and expand as the wave travels through the medium. This compression and rarefaction of air molecules create the perception of sound.
A compression and a rarefaction create a sound wave. In a compression, air molecules are pushed closer together, creating a region of high pressure. In a rarefaction, air molecules are spread out, creating a region of low pressure. This alternation between compressions and rarefactions forms the basis of a sound wave.
An example of compression in a wave is when air molecules are tightly packed together in the region of high pressure of a sound wave. This creates areas of increased density and pressure within the wave.
Compression refers to the region in a sound wave where air molecules are pushed closer together, resulting in higher pressure. Rarefaction, on the other hand, is the region where air molecules are spread farther apart, leading to lower pressure. Together, compression and rarefaction create the alternating pattern of high and low pressure zones in a sound wave.
A compression wave is not matter, it is a transference of energy.