When I heat milk, at some point it begins to boil over. When I reheat the same milk after it has reached boiling point once before, it doesn't boil over again, it just boils "normally". Why is this?
I haven't done extensive testing, and I can't seem to find information about this anywhere; be it in English or in my native language. But here is what has happened to me:
- I make a homemade hot beverage with low fat milk, cocoa, sugar and coffee (a pseudo-Mocha). Enough for 2 cups.
- I boil the pseudo-Mocha, and hope to pay enough attention to prevent it boiling over, but there is still the "rising bubble" phenomenon occurring.
- I pour out one cup, the rest of the liquid stays in the pan.
- A few hours later, I boil the pseudo-Mocha again.
- This time, no bubbly phenomenon occurs, just "classical" boiling.