Why does my porridge burn when I make it with skimmed milk?

The long-running series in which readers answer other readers’ questions on subjects ranging from trivial flights of fancy to profound scientific conceptsWhy is it when I make my morning porridge on the same heat and in the same pan, using skimmed milk it sticks to the pan and burns, but using full cream milk it hardly sticks at all?Colin Brown, Doncaster Continue reading...