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用混合法测定物质的比热的实验中,常因操作不慎给所测定的比热值造成偶然误差。下面从几个主要方面定性分析一下不规范操作对所测比热数值的影响。分析的依据是混合法测定物质比热的原理所遵循的热交换式Q_吸=Q_放,设待测铜块的质量为m_1,比热为C_1,初温t_(01),量热器小筒内所盛水的质量为m_2,比热为C_2,初温t_(02),两者混合后的温度为t,将这些数据代人上式后,经整理可得待测铜块的比热的测定值为:
In experiments where the specific heat of a substance was measured by a mixing method, accidental errors were often caused by the inadvertent manipulation of the measured specific heat value. The qualitative analysis of the effects of non-standard operations on the specific heat value measured is based on several major aspects. The analysis is based on the heat exchange Q_sorption = Q_release followed by the principle of the mixed method for determining the specific heat of a substance, the mass of the copper block to be measured is m_1, the specific heat is C_1, the initial temperature t_(01), and the calorimetric The quality of the water contained in the small cylinder is m2, the specific heat is C2, the initial temperature t_(02), and the temperature after mixing is t. After these data are submitted to the above formula, the copper to be measured can be obtained by sorting. The specific heat of the measurement is: