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[求助] 旋滴法测界面张力 高手请进

最近遇到在用旋滴法测界面张力时遇到一些问题,当两者的密度差特别小的时候,大致在0.02-0.05左右,在样品旋转时,密度小的试样就会呈现两种情况:
1.形状竖直方向的椭圆(即使长度小于宽度,此时软件自动按照长/宽>4计算,显然错误,实际的是长/宽<1。)
2.试样在管壁附近,不会转到样品管中央。
多次测量都是这样,不知道要测这种试样的界面张力时,改怎么办呢?
请高手解答
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