Question

how can u make a paper lip float between two liquids? water and oil

Answer 1

Your paper needs to have a density between that of water and oil. When you mix a bunch of different substances together, they separate based on their density, with the most dense substance sitting on the bottom and the least dense substance sitting on top.

(It's a bit more complicated than that in reality...Archimedes' Principle may come into play, but I think this is enough to answer your question!)