I have recently been reading about vapor pressure and my mind's already blown. I just want to listen from you guys what is vapor pressure in a simple manner. I want to know where is it's direction. Towards the liquid. Let's consider an opened bottle of water which doesn't seem to evaporate at room temperature. Does it have VAPOR PRESSURE? I'll just give away what I know and probably you can fix on that. It is the pressure exerted by the excited liquid molecules which tend to bounce off the liquid. Moreover, what is partial pressure. Thanks in advance to whoever contributes.