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This is all to do with viscosity. Hot water is less viscous (sticky) than cold water, so when it comes out of the tap it makes a higher-pitched splash than water at a lower temperature.You can demonsrate this for yourself at the kitchen sink. Take two mugs of the same size and fill one with hot water and the other with cold.In turn, pour the mugs into the empty sink from the same height and listen to the sound the water makes as it hits the sink bottom. The hotter liquid will sound "splashier" because it is less sticky.