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A partial vacuum is created when suction cups are pushed on to a smooth surface, and a distinct sound is produced when they are pulled apart. Why is this sound produced?

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I am not sure of this answer: Sound travels in the form of pressure waves. The partial vacuum is of extremely low pressure. When this low-pressure region is suddenly exposed to the high-pressure atmosphere, pressure waves will be produced and this results in a sound wave. The frequency and amplitude of the sound produced will depend on the actual conditions.

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  • $\begingroup$ You mean what is that sound you hear when your mom kisses you on the cheek? $\endgroup$
    – my2cts
    Jul 14, 2018 at 7:09
  • $\begingroup$ yes. i think both have the same cause $\endgroup$ Jul 14, 2018 at 7:41

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