hey all, I watched a show recently (probably on discovery or something) about a company producing compressed air powered cars. I thought that was a novel idea, so I looked up the energy density of typical compressed air, and noted that it is at least an order of magnitude less than plain-o'l gasoline. that got me thinking, why not compress something with more... potential, like water. does anyone know how practical it is to compress water and release the energy into a small turbine or cylinder for propulsion? I would think water could achieve higher energy densities, but I could be wrong. not my area of expertise. I am an expert at pushing bits around Please Register or Log in to view the hidden image!