Sound is a vibration or wave of air molecules caused by the motion of an object. The wave is a compression wave that travels through the air at a speed dependent on the temperature. Without movement there could be no sound. When an object moves or vibrates, the air molecules around the object also vibrate. Each molecule moves back and forwards only a tiny distance, but it is enough to cause the air particles to bump into each other. This creates areas where there are many molecules pushed close together (compression); and areas where molecules are spread far apart (rarefactions). These compressions and rarefactions move outwards away from the sound source in circles. A sound wave is created when a series of these pressure changes/waves move through the air. A sound wave contains energy, which in turn m...
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