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《物理教学》1987年第3期第37页“对比热演示实验的一点改进”一文,介绍改用水浴法来做,虽解决了均匀地对试管中的水和煤油加热的问题,但是只能得到相反的结论。因为在[图1]装置中,试管内液体的吸热主要通过传导方式进行,由于水的导热系数[0.00130cal/(cm·℃·s)]约是煤油的导热系数[0.000305cal/(cm·℃·s)]的四倍;而水的比热仅为煤油比热的两倍,所以在
“Physics Education”, No. 3, 1987, p. 37, “A little improvement in the contrast heat demonstration experiment,” an article that describes changing the water bath method to solve the problem of uniform heating of water and kerosene in test tubes. Can only get the opposite conclusion. Because in the device of [Fig. 1], the heat absorption of the liquid in the test tube is mainly conducted through the conduction method, since the thermal conductivity of water [0.00130cal/(cm · °C · s)] is approximately the thermal conductivity of kerosene [0.000305cal/(cm · Four times the °C · s)]; while the specific heat of water is only twice the specific heat of kerosene, so