BOILING-POINT, the temperature, for any given liquid, at which the application of heat ceases to raise the temperature of the liquid and instead converts the liquid into its vapour. The boiling-point of water under normal pressure (barometric height, corrected for temperature and latitude, 76omm. mercury) is ioo° C or 2 I 2° F. The effect of increasing the pressure is to raise the boiling-point ; the presence of dissolved impurities also raises the boiling-point, but to a much less marked extent. (See VAPOR