What is sound

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Sound is a form of energy that travels through a medium - like air, water, or solid materials-in the form of vibrations. When an object vibrates, it causes the surrounding particles to move, creating waves of pressure that our ears detect and our brains interpret as sound. These waves are called sound waves, and they typically travel in a pattern known as a longitudinal wave, where particles move back and forth in the direction of the wave. The key elements of sound include frequency (how high or low a sound is), amplitude (how loud it is), and timbre (its unique tone or quality). Without a medium, such as in outer space, sound cannot travel.