Cold and hot water sound differently
When you pour water into a pan, it publishes a murmur, hitting the walls of the pan. Try to listen to how cold and hot water sound. Due to physical properties, the sound varies significantly.
Heating changes the viscosity of water, since the molecules of which it consists, when heated, begin to move faster. Cold water is thicker and therefore makes a slightly higher sound. If you have a good enough musical ear, you will definitely hear the difference. If you do not want to mess with pots, listen to these notes in which the difference in the sound of the jet is good.