An idea: if oil forms a two dimensional shape, ie a single layer of molecules, then adding 2x amount of oil would give you twice the area. If it is three dimens

An idea: if oil forms a two dimensional shape, ie a single layer of molecules, then adding 2x amount of oil would give you twice the area. If it is three dimensional, say oil makes a bubble, then it would look smaller. Of course this also fails if the oil formed a disc of X layers of molecules