Keegenmould
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The vacuum that holds the water up in the tube. The vacuum created from sealing the tube.
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So my friend and I are working on an engineering project to create a better oil dipstick and all of our best designs utilize a tube that is emersed in fluid and the top is capped. In testing, this idea works well and fluid level is maintained for water, but not oil. Motor oil weighs less than water, so why does it escape the vacuum?