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冬季,我国北方农民常会在晚上往菜窖里放几桶水,你知道其中的奥秘吗?分析在我国北方,冬天夜晚气温比较低,贮藏在菜窖里的蔬菜很容易受冻而坏掉,农民往菜窖里放几桶水正是为了防止蔬菜被冻坏。当夜晚气温降低时,水桶里的水的温度也下降,由于水的比热容(单位质量的物质,温度升高或降低1℃所吸收或放出的热量)较大,在水温下降的过程中,水放出的热量较多,从而保证菜窖里的温度不会下降得过快、也不会太低。
In winter, farmer in northern China often put a few barrels of water into the cellar in the evening. Do you know the mystery among them? Analysis In northern China, winter night temperatures are relatively low, vegetables stored in the cellar are easily frozen and broken, The peasants put a few buckets of water into the vegetable cellar precisely to prevent the vegetables from being frozen. When the temperature drops at night, the temperature of the water in the water bucket also drops. Since the specific heat capacity of water (the mass per unit mass of material, the temperature is increased or decreased by 1 ℃, the heat absorbed or released), the water Release more calories, so as to ensure that the temperature in the cellar will not drop too fast, it will not be too low.