eli5: why does soap get more “soapy” in hot water and disappear in cold water?

Question

eli5: why does soap get more “soapy” in hot water and disappear in cold water?

In: 25

Answer 1

Soap is half fat, half water-soluble stuff. The fat part will congeal like wax in colder temps. Maybe not into one lump but in many small lumps you can’t see. In hotter water, the molecules are moving around more so the fat parts don’t have as much of a chance to stick together, so the soap molecules are getting out there and doing their thing more.