Jill has a beaker. In this beaker there are two layers. The phone top layer is transparent with a yellow tint to it, and the bottom layer is transparent and clear. Jill decides that the bottom layer is probably water. What is the top layer
Vegetable oil. Oil isn’t soluble in water, if layered properly it will float on top of the water in a beaker as you so mentioned. This is due to surface tension and density and a slew of other things I’m not intelligent enough to describe.