Deep-sea diving and

The effect of high pressure on organisms, including humans, is studied to gain information about deep-sea diving and anesthesia. A sample of air occupied 1.00 L at 25°C and... 

Applications in enhanced combustion and life-support systems provide the majority of the demand for oxygen. It is used extensively in medical applications for therapeutic purposes, for resuscitation in asphyxia, and with other gases in anesthesia. Also it is used in high-altitude flying and deep-sea diving, and it is used for life-support and as a fuel oxidizer in the U.S. space program.1... 

B22. Behnke, A. R., Jr., Physiologic studies pertaining to deep sea diving and aviation especially in relation to the fat content and composition of the body. Harvey Lectures 87, 198-226 (1941). 

The helium we use for deep-sea diving and filling balloons is separated from natural gas as it is brought to the surface. This helium was formed in the depths of the earth by radioactive decay and remains trapped with the natural gas deposits. 

Helium was identified by its characteristic emission spectrum as a component of the sun before it was found on earth. The major sources of helium on earth are natural gas deposits, where helium was formed from the a-particle decay of radioactive elements. The a particle is a helium nucleus that can easily pick up electrons from the environment to form a helium atom. Although helium forms no compounds, it is an important substance that is used as a coolant, as a pressurizing gas for rocket fuels, as a diluent in the gases used for deep-sea diving and spaceship atmospheres, and as the gas in lighter-than-air airships (blimps). 

Soda lime eonsists of hydrated lime treated with caustic soda solution. It is used for absorbing carbon dioxide from air in medical, deep sea diving and military applications. It is manufactured by mixing hydrated lime with about 3 % of caustic soda and sufficient water to enable the paste to be extruded into pellets some 4 mm in diameter and 8 to 15 mm long. The pellets are then dried, screened and re-hydrated to a moisture content of about 20 %. 

Knowing the partial pressure of gases like oxygen is important in deep sea diving and the operation of respirators in hospitals. 

Low or ambient temperature deep oxidation Metal oxide catalysts are the preferred catalysts for the ambient temperature oxidation of carbon monoxide and they are extensively used for respiratory protection in applications such as mining, deep sea diving, and submarine life support. 

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