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While being accosted by the various electrostatic discharges a person experiences in life, I have noticed that the pitch and timbre of their sound varies greatly.

What factors determine these properties of a spark's sound?

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  • $\begingroup$ It depends on the nature of the gas surrounding it. If I am not wrong, you hear the sound because of the rapid expansion of the air molecules due to the heat generated by the spark. $\endgroup$ – Yashas Aug 18 '16 at 1:43
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According to Fig. 3 of https://hal.archives-ouvertes.fr/hal-00810828/document , it looks like the average frequency of sound from a spark decreases (the average period increases) as the gap between the electrodes increases.

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  • $\begingroup$ That you for this very interesting article. How did you find it? $\endgroup$ – Etherian Aug 18 '16 at 13:34
  • $\begingroup$ @Etherian: The dumbest Google queries work the best:-) I used: spark acoustics $\endgroup$ – akhmeteli Aug 18 '16 at 23:39

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