Liquefaction of gases?
After separating Hydrogen and Oxygen from water (through electrolysis), how should I go about Liquefying and storing these gases? One method of liquefaction that I've come across is here ( http://1.bp.blogspot.com/_OGu0H7TFUno/SLI8QOVkemI/AAAAAAAAABk/Y0fenD3BvbE/s1600-h/ln2_generator.jpg ), and another is here (http://www.gizmology.net/liquid_air.htm) Both of these include compression, but the latter cools the gas by expanding the room-temperature gas, and therefore cooling it. Which method is best? Are there any others?