On 2017-06-30, Augustine Leudar wrote:
its not the heat Dave - its the humidity (100 percent) that destroys speakers , that and the ants . Who funded that ?
Also what mostly throws off your naïve sound speed calculations. Temperature and the humidity which typically goes along with it jointly behave somewhat counter-intuitively when you input them into the full wave equation, dealing with multiple mixed gases at the same time.
BTW, that brings to mind a totally unrelated thingy. It's a standard pop physics question why does a boiling pot seem to go from higher to lower sounding noise. Most plausible accounts of the phenomenon I've seen speak high-falutin stuff about average sizes of bubbles and whatnot.
Then a theoretical physics friend of mine once offered a (seemingly) quite different, unexpected and in hindsight obviously correct answer: the viscosity of water drops just as that of pretty much any fluid we consider normal while its temperature rises. When you input the two numbers representing that into the relevant equations, your first order approximation just drops out. If you want to do something second order or further, you'll have to start speaking about bubble sizes and whatnot, but they too scale with temperature and viscosity, at first linearly around the phase transition from whence they come.
Goes to show, you're exactly right: a change of viewpoint from temperature to humidity, from energy level to how water behaves in it, often explains more and more simply than temperature by itself. 8)
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