Why Doesn't Hand Swaying Produce Sound?

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Hand swaying does not produce sound because the frequencies and amplitudes generated are typically too low for human hearing. In contrast, scratching skin creates audible sound as it falls within the human hearing range. A sudden, fast movement of the hand towards the ear can produce a dull thump, perceived more as a gust of wind due to its low frequency. Additionally, moving quickly towards a sound source can result in a noticeable Doppler shift. Overall, the differences in sound production relate to frequency and amplitude levels.
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Why doesen't hand swaying produce sound and why does my slight scratching my skin produce an audible sound?
 
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It does, it's just too low frequency/amplitude for you to hear it. Scratching is within the range of human hearing.
 
It can, if you move your hand suddenly, and fast enough towards your ear, you can detect a dull "Thump", but it's so low in frequency that it's more of a gust of wind. In passing, you can actually hear a doppler shift if you generate a pure sine wave from a speaker and jerk your head towards it very hard...or away from it.
 

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