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冬天,河面都结冰了,可是河水下面却没有结冰,甚至还有鱼儿游动这是为什么呢?A:原来,这是水的一种特性所导致的。水温在4℃时,水的密度最大。当水温在0~4℃时,水的密度是随着温度的上升而上升;而水温在4~100℃时,水的密度是随着温度的上升而减小。冬天,随着气温的下降,水面的温度也降低。水温高于4℃时,冷水比热水的密度大,因此表面的冷水会向下沉,而底部较
Winter, the river is frozen, but there is no ice below the river, there are even swimming fish This is why? A: It turned out that this is a characteristic of water caused. Water temperature at 4 ℃, the water density. When the water temperature is 0 ~ 4 ℃, the density of water increases with the increase of temperature; while the water temperature is 4 ~ 100 ℃, the density of water decreases with the increase of temperature. In winter, as the temperature drops, the surface temperature also decreases. When the water temperature is higher than 4 ℃, the density of cold water is higher than hot water, so the surface of the cold water will sink, and the bottom of the more