define-infrasonic sound
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Infrasound, in its popular definition as sound below a frequency of 20 Hz, is clearly audible, the hearing threshold having been measured down to 1.5 Hz. ... Sources of infrasound are in the range from very low-frequency atmospheric fluctuations up into the lower audio frequencies.
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These are the sound waves that have a frequency lower than 20Hz. They are not audible to human ears
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