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A life-support system for APOLLO is approximately 26kg in weight. and called Apollo Portable Life Support System (PLSS). Oxygen was supply from this System then keep astronaut's life for about seven hours continuously. 1.05 pound oxygen was housed in 46.6 square ibch tank with 900 psi. Oxygen was supply from Inlet gas connectors to helmet directly with temperature of 7.2 - 10 degree Celsius (45 - 50 degree Fahrenheit). And directed through ducts to the exhaust gas connectors with temperature of 26.6 - 29.4 degree Celsius (80 - 85 degree Fahrenheit). The impurities in the exhaust gas are removed by PLSS, then used for breathe again. It passes through a canister containing deactivated charcoal and lithium hydroxide, which absorbs the carbon dioxide and purifies the gas. Liquid Cooling Garment (LCG) is also donned under the space suit. It consists of a nylon Spandex material which supports a network of Tygon tubing through which water from the PLSS. Water or coolant is put through from PLSS, absorb body temperature, refrigerated in PLSS again. Two 16.8 volt battery provided electrical power. These battery were 4 pound weight each. The upper part of PLSS houses emergency oxygen tank and communication unit. Astronaut can extend life time for 30 minutes with this emergency oxygen tank. A life-support system used by SkyLab project was called Skylab Astronaut Life Support Assembly (ALSA).