Breathing gas is a mixture of gaseous chemical elements and compounds used for respiration.
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17 Facts About Breathing gas
2.
The oxygen is usually the only metabolically active component unless the gas is an anaesthetic mixture.
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3.
Some oxygen in the breathing gas is consumed by the metabolic processes, and the inert components are unchanged, and serve mainly to dilute the oxygen to an appropriate concentration, and are therefore known as diluent gases.
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4.
Breathing gas air is atmospheric air with a standard of purity suitable for human breathing in the specified application.
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5.
Concentration of oxygen in a Breathing gas mix depends on the fraction and the pressure of the mixture.
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6.
Maximum safe PO2 in a breathing gas depends on exposure time, the level of exercise and the security of the breathing equipment being used.
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7.
Each breathing gas has a maximum operating depth that is determined by its oxygen content.
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8.
Gases which have no metabolic function in the breathing gas are used to dilute the gas, and are therefore classed as diluent gases.
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9.
Nitrogen in a Breathing gas mix is almost always obtained by adding air to the mix.
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10.
Helium is an inert Breathing gas that is less narcotic than nitrogen at equivalent pressure, and it has a much lower density, so it is more suitable for deeper dives than nitrogen.
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11.
Neon is an inert Breathing gas sometimes used in deep commercial diving but is very expensive.
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12.
Argon is an inert gas that is more narcotic than nitrogen, so is not generally suitable as a diving breathing gas.
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13.
When breathing gas is recycled in a rebreather or life support system, the carbon dioxide is removed by scrubbers before the gas is re-used.
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14.
Carbon monoxide is a highly toxic Breathing gas that competes with dioxygen for binding to hemoglobin, thereby preventing the blood from carrying oxygen.
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15.
Oxygen and helium analysers are often used on the surface during gas blending to determine the percentage of oxygen or helium in a breathing gas mix.
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16.
Excessive density of a breathing gas can raise the work of breathing to intolerable levels, and can cause carbon dioxide retention at lower densities.
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17.
Exhaled Breathing gas is passed through a scrubber to remove carbon dioxide, and the anaesthetic vapour and oxygen are replenished as required before the mixture is returned to the patient.
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