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用混合法测定铜的比热,有时即使严格按照操作要领进行实验,测得的结果往往与铜的比热的标准值存在较大的误差,笔者认为,其中重要的原因是水和铜块的质量选择不当。那么,该怎样来确定它们的质量呢? 1 关于水质量的选取在测定铜的比热中,为了使问题简化,常常不计量热器内筒和搅拌棒吸收的热量,如果水的质量远大于内筒和搅拌棒的质量,铝质内简和搅拌棒吸收的热量可忽略不计,但当水的质量取得过少,少到与内筒和搅拌棒的总质量相当(或更小)时,其热损失就非常可观。
The specific heat of copper is measured by the mixed method. Sometimes, even if the experiment is strictly conducted in accordance with the operating principle, the measured result tends to have a large error with the standard value of the specific heat of copper. The author believes that the important reason is the water and the copper block. Improper selection of quality. So, how to determine their quality? 1 About the choice of water quality In determining the specific heat of copper, in order to simplify the problem, the heat absorbed by the inner tube of the heat exchanger and the stirring rod is often not measured, if the quality of water is much greater than The quality of the inner tube and stir bar, the internal heat of the aluminum and the heat absorbed by the stir bar are negligible, but when the quality of the water is too low to be equal (or smaller) to the total mass of the inner tube and the stir bar, The heat loss is very significant.