I'm having some trouble grasping the concept of the so called "tripple point". I can't begin to imagine that three different fases can possibly coexist. The temperature is 0,01C isn't it? Well, if some snow has this temperature, and then turns into a liquid, then that's because the temperature isn't longer 0,01! And if water vapour is cooled to 0,01C, then it would just freeze to snow wouldn't it?! Can someone please explain this strange concept to me...?