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.

Answer 1

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