Does increased atmospheric pressure increase or decrease the boiling point of water? Why is this so?
Solution 14RQ Step 1 of 2: Boiling point of the liquid is the condition at which the vapour pressure equals atmospheric pressure. The vapor pressure of a liquid tells about, how fast the molecules leave the liquid state and convert to gas. Under normal conditions, the vapor pressure of water is low, resulting in few molecules leaving the liquid via evaporation. That is, in a liquid some particles always have enough energy to escape to the gas phase. Gaseous particles are also returning to the liquid. As temperature increases,the kinetic energy of the molecules increases. Therefore, more particles have enough energy to escape to the gas phase. This increases the vapour pressure. When the vapour pressure equals atmospheric pressure, the liquid boils. Such point is know as boiling point and corresponding temperature is boiling temperature of liquid.