Nov 12th 2017, 07:29 AM
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#5 |
Senior Member
Join Date: Apr 2015 Location: Somerset, England
Posts: 995
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The high density liquid will try to find a position below the low density liquid.
If you add the low density liquid first, the high density liquid will try to move through and/or around the low density liquid to get to the bottom, and you are likely to end up with the two liquids mixing.
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It's worse than that.
Since the liquids are immiscible, they will eventually separate.
When they do, if you add water second, you could end up with some oil on each side of the U tube, held apart by the water plug in the bottom.
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