question_answer

What happens if water vapour at a pressure of \[\mathbf{0}.\mathbf{004}\text{ }\mathbf{atm}\] is cooled to\[\mathbf{0}{}^\circ \mathbf{C}\]?

Answer:

                The pressure corresponding to triple point is 610 Pa which is equal to nearly\[0.00\text{6 atm}\]. It follows from the P-T phase diagram of water that at a pressure lower than this pressure, water vapour condenses directly to ice without passing through the liquid phase.