Earlier this day, I was rinsing out the cans of red beans with cold water. Guess what: Warm water does a better job at that. It makes sense, because we generally know everything gets a better shine if you throw hot water at something. But why is that?
For that you have to look closely at what water actually is: it’s a bunch of molecules. When putting the heat on water, the exchange of energy makes these water molecules move faster and faster. Faster moving molecules (naturally) are better in ‘batting’ off stains (other molecules) than slower ones.
While I was trying to dissolve all of the bean residue, I was thinking of the ‘magic’ properies of soap. However, using soap with water, is not what I consider ‘fair play’. If water molecules were living things, they’d probably enjoy scooting around without the help of soap molecules.