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- 1.As already stated , hot liquids can have a different viscosity than cold liquids . How much difference this makes depends on the liquid . However , there are other important factors as well . For example , when you pour hot water into a container , the water heats up the air in the container which in turn affects the speed of sound through that air and thereby changes the pitch of the sound .
Steam also plays a role here . Then there's the expansion the container undergoes as a result of the heat of the liquid , which changes the resonant frequencies of the container and thereby changes the sounds it produces .
Cold liquids also may contain more dissolved gas ( typically air , i.e. nitrogen and oxygen ) which are removed partially or entirely as a result of heating . Not sure if and how much that would be audible , but it is in the mix somewhere .
Explanation:
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