I've been reading about vapor pressure and it's a bit confusing. For example when water is in equilibrium between the solid and liquid phase, my textbook says that the vapor pressure is equal between the two.
Now I know this might sound stupid for someone who knows much more than me, but why is there vapor pressure in the equilibrium between a solid and a liquid?
Do the molecules with high kinetic energy go directly from the solid to the vapor form?( same thing with liquid). If not I don't know what that vapor pressure means in this case.
I only understand it in the case of equilibrium between liquid and gas.
Also note that I'm talking of the equilibrium between solid and liquids in water so the temperature would be increasing from 0 celsius up until it's fully a liquid