毛细管流量计是物化实验室中经常使用的一种测量气体小流最的仪器,使用前必须经过精密标定。当用该仪器测量多孔体的气体流量时,已经标定好的流量-刻度函数关系发生改变,所测数据不能直接利用。本文从理论上分析了流量-刻度函数关系改变的原因,并据此导出了可以实用的流量修正数学表达式。 Capillary flowmeter is commonly used in physical and chemical laboratories to measure a small flow of gas equipment, must be carefully calibrated before use. When using the instrument to measure the gas flow rate of the porous body, the calibrated flow-to-scale relationship has been changed and the measured data can not be used directly. In this paper, the reason of the change of the relationship between flow and scale function is analyzed theoretically, and then a mathematical expression of flow correction is derived.