Lengthen the oil ball when rotating around the horizontal axis at high speed. Under the action of external force, crude oil gradually becomes a cylindrical liquid column or an elliptical droplet. The shape of crude oil in aqueous solution is determined by the rotation speed and the interfacial tension between oil and water. During the experiment, take pictures automatically every 5 minutes in the first 15 minutes, and then take pictures automatically every 15 minutes. After 2 hours of experiment, measure the length and diameter of oil drops in the pictures, and record the interfacial tension of the liquid to be measured<br>
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