SAT2物理水的热胀冷缩问题书上写:”as a lake is cooled at the surface by the atmosphere,the bottom of the lake tends to reach and maintain a temperature of 4°C“为什么?

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SAT2物理水的热胀冷缩问题书上写:”asalakeiscooledatthesurfacebytheatmosphere,thebottomofthelaketendstoreachandmaint

SAT2物理水的热胀冷缩问题书上写:”as a lake is cooled at the surface by the atmosphere,the bottom of the lake tends to reach and maintain a temperature of 4°C“为什么?
SAT2物理水的热胀冷缩问题
书上写:”as a lake is cooled at the surface by the atmosphere,the bottom of the lake tends to reach and maintain a temperature of 4°C“
为什么?

SAT2物理水的热胀冷缩问题书上写:”as a lake is cooled at the surface by the atmosphere,the bottom of the lake tends to reach and maintain a temperature of 4°C“为什么?
那句话只是在一定条件下说的,具体来说,水没成或没全成冰,并且外界温度小于4°C.他的这句话的意思是,4°C水的密度是其在所有温度中最大的.若外界温度在4°C以下,而水温在4°C以上,那么水在冷确的过程中表层的水会下沉,之后的结果就是,底层的水会达到4°C,而不会再降,因为4°C以下的水会浮在上层.但是,如果在水的整体都开始比4°C低时,底层的温度也自然降低,但是依然是整体温度最高的地方.最终,水全部成冰.