Ice is the only substance that has a lower density as a solid than as a liquid. Its density is 0.92 g/cm3 as a solid and 1 g/cm3 as a liquid. Mercury has a density of 14.184 g/cm3 as a solid and 13.69 g/cm3 as a liquid. Carbon dioxide has a density of 1.56 g/cm3 as a solid and 1.10 g/cm3 as a liquid. NaCl has a density of 2.71 g/cm3 as a solid and 1.556 g/cm3 in molten state.