There is nothing more solid then water. Its incompressible. It may push something or pull or in fact do both. A gas force at one end of a water filled pipe will empty that pipe of water. Having that water drive a hydro turbine creates an energy conversion. Having the water flow pool in collector possitioned above the place of gas force inlet means the same water will drain down if the gas force is removed. All water drainage creates a vacuum pulling on that behind the water. To obtain turbine motion at least cost its best to choose a liquid that turns to gas at very low heat or allready is a gas. The gas itself is best if highly expanding at very low heat. Carbon Dioxide is one gas ideal in such purpose. Further benefit is obtained if the gas is very easy to cool. Carbon Dioxide is more than ideal, rather than cooling it one has to stop it from freezing. Contrast of work ethic between commonly used Steam, and slowly getting a foothold Carbon Dioxide. Example the making of electricity. 175 bar (attmosphere) of force creates 350 megawatts of electricity. All turbine are driven by force be it liquid or gas. Steam is liquid at 100* Celsius. Carbon Dioxide is liquid at 32* Celsius. Water at 550* Celsius produces 175 bar Steam force. Carbon Dioxide at 100* Celsius produces 7,000 bar of force. Kilowat and Horsepower are a calculation of force multiplied by volume per second. IE, One litre water at 9 bar pressure passing through the turbine each second produces 720 watts. This increases by force, or volume per second. Line pipe construction forms all casing if heating be above plus 2 degree Celsius and Carbon Dioxide the heat reactant. Force to temperature Phase Graph begins CO2 Critical that under 32* Celsius and CO2 Super Critical that over 32* Celsius. So long the hot zone remain higher temperature than the cold zone a liquid current occurs at force. Copper pipe and car water pump complete a Steam version and a low heat CO2 version. Both Tennis and Squash ball make excellent trip valve sitting attop the liquid ladder. Please Register or Log in to view the hidden image!