提高最大气泡法测定溶液表面张力准确性研究

Study on Improving Accuracy of Measuring Surface Tension of Solution by Maximum Bubble Method

探究了最大气泡压力法测表面张力实验中出泡速率、读数方法和温度对实验准确性的影响。得出的结论是调节出泡速率为每分钟5~15个时ΔP_(max)值准确度更高;读数是压力计显示的最负数值取绝对值,即最大值;同时发现最大附加压强差呈规律性重复变化,ΔP_(max)与气泡个数存在线性关系;在37~62℃范围内温度越大ΔP_(max)值下降越快。

The effect of foaming rate,reading,and temperature on experimental accuracy in the maximum bubble pressure test surface tension test was explored.It was concluded thatΔP_(max) value was more accurate when the bubble rate was adjusted to 5 to 15 per minute.The reading was the absolute value of the most negative value displayed by the pressure gauge,which was the maximum value.The error was the smallest,and the maximum additional pressure difference was found to be regularly and repeatedly changed.ΔP_(max) had a linearly equal relationship with the number of bubbles.The higher the temperature was in the range of 37~62℃,the fasterΔP_(max) value decreased.