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鄂州市泽林镇陈海小学自然教师王兰亭问:物体有热胀冷缩的性质,水也一样,可是一冷到零度以下结成冰,它的体积反而扩大了,这是怎么回事? 新疆乌鲁木齐市师范学校魏志芳、于广海两位老师说:水是一种特殊的物质,4℃以上的水具有热胀冷缩的性质,而0℃的冰熔为0℃的水升温到4℃时却具有“热缩冷胀”的性质。4℃的水在溫度升高或降低时,体积都要增大,密度都要减少,4℃的水体积最小,密度最大。为什么会有这种反常现象呢?因为
Ezhou Zelin Chenhai Primary School natural teacher Wang Leting asked: objects have the nature of thermal expansion and contraction, water is also the same, but a cold to zero below the formation of ice, but its volume has expanded, but how is it? Wei Zhifang and Yu Guanghai, two teachers in Urumqi, Xinjiang Normal University, said: Water is a special kind of substance. Water above 4 ℃ has the characteristics of thermal expansion and contraction. However, when the temperature of 0 ℃ is 0 ℃, the temperature of water is raised to 4 ℃ when it has a “hot shrinkage” of the nature. 4 ℃ water temperature increases or decreases in temperature, the volume should be increased, the density should be reduced, 4 ℃ minimum volume of water, the maximum density. Why is there such an anomaly? Because