[Ricochet]

That doesn't even make sense. Something that compresses into a liquid/gas or whatever can be compressed further depending on its properties. If you compress LPG to the point it becomes a liquid, do you know what happens when you compress it a little further? It becomes a more dense liquid. The temperature drops slightly, the molecules come closer together, and if more is stored in a container; the pressure increases. Water is a great example, and shares many similar properties with LPG. Water can be a dense vapor, or a light vapor. It's not like it thaws into a liquid at 1*C, and then boils at 2*C. It's a liquid until it boils or freezes, and has a different temperature and density at each point between while maintaining its liquid state. Propane is no different, and maintains its liquid form throughout a range of temperature and density. It's physics.