Can't live without????
October 28, 2006 8:11am CST
What is the one thing you can't live without.
28 Oct 06
OXYGEN....Oxygen is essential to respiration, so oxygen supplementation has found use in medicine (as oxygen therapy). People who climb mountains or fly in depressurized aeroplanes sometimes have supplemental oxygen supplies; the reason is that increasing the proportion of oxygen in the breathing gas at low pressure acts to increase the inspired oxygen partial pressure nearer to that found at sea-level. A notable application of oxygen as a very low-pressure breathing gas, is in modern spacesuits, where use of nearly pure oxygen at a total pressure of about 1/3rd normal, results in normal blood partial pressures of oxygen. This tradeoff of breathing gas content and needed pressure is important for space applications, because flexible spacesuits working at Earth sea-level pressures remains a technological challenge beyond today's capabilities.