论文部分内容阅读
分析了空气浮力对天平质量称量结果的影响,定义了“浮力偏差”、“相对偏差”的概念,并推导了天平测量中浮力偏差的计算公式,获得了相对偏差与被测物体密度和砝码密度之间的关系。所获得的主要结论有:当被测物体密度低于砝码密度时,浮力偏差为正值,反之为负值;若被测物体密度高于砝码密度,最大相对偏差为0.015%;反之,相对偏差随砝码与物体密度之比线性增大。
The influence of air buoyancy on weighing quality of balance was analyzed. The concept of “buoyancy deviation” and “relative deviation” were defined. The formula of buoyancy deviation in balance measurement was deduced. The relative deviation and the density and weight of measured object were obtained. The relationship between code density. The main conclusions obtained are as follows: when the measured object density is lower than the density of the weight, the buoyancy deviation is positive and vice versa; if the measured object density is higher than the weight density, the maximum relative deviation is 0.015%; on the contrary, The relative deviation increases linearly with the weight-to-object density ratio.