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一般物质都是:温度升高,密度减小;温度下降,密度增大。但是,水的密度却是:温度比4℃高的时候,密度随着温度的升高而减小;温度比4℃低的时候,密度随着温度的升高而增大;在4℃的时候,水的密度最大。为什么水有着这样的特殊现象呢?现在有三个解释。第一个解释,是从水的缔合说出发的。一般物质的密度所以随着温度的升高而减小,是因为温度升高的时候,物质内部分子热运动增强,分子间的距离增大。温度降低的时候,分子热运动减弱,分子间的距离随着减小,所以它的密度就增大了。水除了
The general materials are: temperature increases, density decreases; temperature decreases, density increases. However, the density of water is: when the temperature is higher than 4°C, the density decreases with increasing temperature; when the temperature is lower than 4°C, the density increases with the increase of temperature; at 4°C At the time, the density of water is greatest. Why does water have such a special phenomenon? There are now three explanations. The first explanation is based on the theory of association of water. The density of the general material therefore decreases with increasing temperature because when the temperature rises, the thermal motion of the molecules inside the material increases and the distance between the molecules increases. When the temperature decreases, the molecular thermal motion weakens and the distance between molecules decreases, so its density increases. Water addition