Quite an amazing article here @greenrun. I could tell the difference between the sounds, even though I had never thought of it in that way.
I've always known the relationship between the movement of molecules and temperature changes, only that I hadn't thought of it in regards to being able to "hear" whether water is hot or cold.
The concept of molecular movement and temperature variation is also applicable to ocean currents and density of the ocean water, which comprises of warm and cold ocean currents. This is because cold water is more dense and heavy, due to low temp and its slow-moving or reacting molecules. While hot water is lighter, less dense and flows more freely due to rapid movement of the molecules.
A very informative post @greenrun, thanks for sharing.