# How do we assess the relative densities of liquids. Will oil float on water?

One exception is $\text{methylene chloride}$, which has $\rho = 1.33 \cdot g \cdot c {m}^{-} 3$. But this is an exceptional case. Most organic solvents, $\text{petroleum ether}$, $E {t}_{2} O$, are LESS DENSE than water and will float ABOVE the aqueous phase.