# Vapor pressure and boiling point for solutions in open containers

Question 1: If we have an open container which has water in it and is heated. If there is no lid over the container then how can this water ever boil as there will be no vapor pressure created over the water surface.

Question 2: What is the logic in the fact that boiling starts when vapor pressure becomes equal to atmospheric pressure.

• – Mithoron Oct 8 '15 at 12:48
• as there will be no vapor pressure created over the water surface. This part is not really true. There will be vapor pressure created over the water's surface. It might not ever reach atomspheric pressure, but it will rise as the temperature of the pot of water is raised. Exactly how will depend on a complex balance of convective and conductive fluid transport mechanisms (e.g. is there a fan blowing across the surface of the water or not). – Curt F. Dec 7 '15 at 15:58