How Does A Drop Of Coffee Bead Up On And Float In A Hot Cup With Milk/cream?

22 June 2009 in Coffee maker

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?


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22 June 2009 Coffee maker

2 Comments to How Does A Drop Of Coffee Bead Up On And Float In A Hot Cup With Milk/cream?

  1. 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.

    2. (Ω)Mistress Bekki on 22 June 2009

  2. I think this is becose of the surfsce tension.

    3. Sad Videos on 22 June 2009

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