Question

If an oil drop of radius 0.25mm spreads on the surface of water to form an oil patch of diameter 0.1m,estimate the length of the oil molecule.

Answers

assuming the circle is one molecule thick, then working in mm, we have
π(100)^2 x = 4/3 π(0.25)^3
x = 2.08 * 10^-6 mm

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