Warm water freezes more quickly than cold. Sir Fr

Warm water freezes more quickly than cold. Sir Fr
ancis Bacon said that almost four hundred years ago. But few people believed him – till 1970. In that year Canadian scientist George Kell proved the English scholar was right. Dr. Kell filled an open pail with cold water. He exposed both to the same low temperature. The warm water froze first.The lack(缺少) of covers on the pails was the secret. Some of the warm water changed to vapor. (水蒸气) It evaporated(蒸发) 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 – even though it had a greater temperature drop to make.
Sir Francis Bacon was
(A) an American experimenter 1 (B) a Canadian scientist 1 (C) an English scholar 1 (D) an Australian writer
Dr. Kell’s pails were both
(A) filled with water 1 (B) left uncovered 1 (C) exposed to the same temperature 1 (D) all of the above
The second paragraph tells why
(A) Dr. Kell was studying water 1 (B) the warm water froze first 1 (C) Dr. Kell used pails in his work 1 (D) water freezes in underground pipes
No water vapor would have escaped into the air if the pails had been
(A) warmed 1 (B) covered 1 (C) shaken 1 (D) filled
The cold water froze more slowly because
(A) salt was added to it 1 (B) its pail was smaller 1 (C) there was more of it left 1 (D) the air near it was moving
lgy820922 1年前 已收到1个回答 举报

lovelisa0424 幼苗

共回答了21个问题采纳率:90.5% 举报

答案是CDBBC

1年前

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