If you have been under the impression that oil always floats on water, you're half-right. Chi Phan from Curtin University in Australia and his team have shown us that this is not always the case and it is indeed a discovery that could be useful for cleaning up oil spills. In a video, the researchers added a droplet of water to canola oil and it stayed on top of the oil as they added subsequent droplets of water, it make the surface too big and that's when gravity overcomes the forces involved and causes the water to lose its support by the oil and sink.
Ubergizmo, Water Drops that Float on Oil May Help Clean Up Spills
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