If I run the bath and close my eyes, I can tell when the water exiting the faucet goes from cold to hot. The loud rushing sound deepens by half an octave. What causes the tone to drop?
In: 67
[Tom Scott](https://youtu.be/Ri_4dDvcZeM) has a pretty cool short video about the fact we can hear temperature.
As others have said it’s to so with viscosity/density of warm/cold.
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