在一般的物理化学实验中,人们往往使用一种简便易行的毛细管流量计,测定气体的小流量,通常实用范围大体可在10毫升/分到10升/分。但是对毛细管的选择及其流量的标定确全靠工作人员的经验。尽管如此往往也要花费大量的物力和时间。为此,我们在工作中用最小二乘方法处理了实验数据以及采用光滑管阻力系数(f)进行流量与压强关系式之推导。分别求出适于层流区域和湍流区域的经验公式如下: 层流公式: In general physical and chemical experiments, people often use a simple and easy capillary flow meter, the determination of small gas flow, the general practical range of roughly 10 ml / min to 10 liters / min. However, the choice of capillary and its calibration of the flow is indeed based on the staff’s experience. In spite of this, it often takes a lot of material and time. For this reason, we used the least square method to deal with the experimental data and the derivation of the relationship between flow rate and pressure by using the smooth pipe drag coefficient (f). The empirical formulas that are suitable for the laminar flow region and the turbulent flow region respectively are as follows: Laminar flow formula: