Beading Up
Posted on Tuesday, February 15th, 2011 at 6:46 am
How does a drop of coffee bead up on and float in a hot cup with milk/cream?
When I get a fresh cup of coffee and add milk/cream- sometimes when I take my spoon out (after stirring) and a drop of coffee from the spoon falls onto the coffee- the dropped coffee beads up and dances on the top of the coffee cup. Why is that? Is there a difference in surface tension for coffee and cream? Or is it related to the heat?
The fat in the cream is non-polar. The water is polar. So the cream tends to stick to itself and bead up. Surface tension is a measure of its tendency to do that.
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