## Chemistry (4th Edition)

Liquids and solids: $g/cm^3$ Gas: $g/L$
That difference happens due to the fact that the density of gas is usually very small if represented in $g/cm^3$, in the order of $10^{-2}$ or $10^{-3}$. So, chemists use $g/L$ to be able to represent these numbers more easily.