10 A drop of olive oil of radius 1mm spreads into a circular film of diameter 40 cm on - Physics - Units and Measurements

Question

10 A drop of olive oil of radius 1mm spreads into a circular film
of diameter 40 cm on water surface Estimate the size of an oil
molecule

Ayush Mittal · Answer

Let us suppose that olive oil spreads as a film which is one
molecule thick on the water surface then the thickness of the film
would give an estimate of diameter of the molecule d= Volume of the
oil drop / Area of the film = 4/3πr^3/πr^2 =4/3 *(1/10)^3
*1/400 = 0 33 *10^-5 = 3 3 *10^-6 cm = 3 3 *10^-8 m

10. A drop of olive oil of radius 1mm spreads into a circular film of diameter 40 cm on water surface. Estimate the size of an oil molecule.