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A small drop of oil has a volume of 5x10^-8 m^3. When it is put on the surface of...
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High School Teacher
Assumption: the circular film is one molecule thick (a monolayer).
The circular film can be treated as a cylinder with a very large cross-sectional area compared to its height which is the same as the size of one molecule. Imagine a million ping pong balls floating in a circular patch on a lake.
The volume of the film is the same as the original drop.
Volume of a cylinder, V = A x h (A = area of film, h = height)
Rearrange for h: h = V / A = (5 x 10^-8)/(0.1) = 5 x 10^-7 m
Posted by nessus on July 4, 2011 at 5:51 PM (Answer #1)
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