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根据以下材料回答第 1～4 题：Warm water freezes more quickly than cold water．Sir Francis Bacon said that almost four hundred years a90．Bot few people believed him．Later，a Canakian scientist George Kell prox。ed the English scholar was right．Dr Kell filled an open jar with cold water．tie filled anc ther，which was of the same size，with warm water He made both the same klw temperat ire．And the warm water froze first．
What was the reason?Some of the warm water changed into vapour．It went into the air.This meant that less of the warm water was left to freeze．And so the warm water froze faster than the cold water．
Sir Francis Bacon was ．
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