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…showed last 75 words of 722 total…air (yes, water or Jell-O) that gets moved with each pulse of pressure. Without going far into the physiology of it, you hear sounds when the pulses of compressed air of sound waves excite your eardrum, which excites your inner ear, which sends signals to your brain, which makes you dance, dance, dance! In general, you perceive the frequency of the wave as a particular pitch. You perceive the amplitude of the wave as loudness.