WordNet

being essentially equal to something; "it was as good as gold"; "a wish that was equivalent to a command"; "his statement was tantamount to an admission of guilt" (同)tantamount
the atomic weight of an element that has the same combining capacity as a given weight of another element; the standard is 8 for oxygen (同)equivalent_weight, combining weight, eq
a person or thing equal to another in value or measure or force or effect or significance etc; "send two dollars or the equivalent in stamps"
a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earths crust (同)O, atomic number 8

PrepTutorEJDIC

同等の,同量の,同価の / 同等(同価,同量)の物;(文法で)(…の)相当語句《+『for(of)』+『名』》
『酸素』(化学記号はO)

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2014/06/07 22:47:23」(JST)

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Oxygen equivalent compares the relative amount of oxygen available for respiration at a variable pressure to that available at SATP. As external respiration depends on the exchange of gases due to partial pressures across a semipermeable membrane and normally occurs at SATP, an oxygen equivalent may aid in recognizing and managing variable oxygen availabiity during procedures such as hyperbaric oxygen therapy or medical air transport.

It does so by expressing oxygen concentration as a ratio of the partial pressure of oxygen at a given altitude or pressure to Standard Atmospheric Pressure; rather than as a ratio of the PO₂ at a given pressure to the total pressure of the gas mixture. The latter would generally be 0.2095, the atmospheric concentration by volume of O₂, although FO₂ and P_atm vary for extraterrestrials. Calculations occur as follows:

Let O₂E be oxygen equivalent, FO₂ be the fractional concentration of oxygen, P_atm (generally 760 mmHg, barring intergalactic travel), P_b be the barometric pressure, and dP be the change in pressure at a given altitude. Then,

O₂E = FO₂(P_b + dP)/ P_atm

It is worthwhile to note that pressures may often be expressed in units of distance such as feet when diving. For this, note that descending 33 ft in salt water or 33.9 ft in fresh water results in a change of 1 atm, so distance and pressure are used interchangeably in this context.

References

Williams, Paul. 'Lectures on Respiratory Physics'. Ed. J. Brown et al. (London, ON: FC, 2011).

This respiratory system article is a stub. You can help Wikipedia by expanding it.

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1. 酸素維持装置 oxygen conserving devices
2. 新生児における酸素のモニタリングおよび治療 oxygen monitoring and therapy in the newborn
3. 酸素を備えている民間航空機での旅行 traveling with oxygen aboard commercial air carriers
4. 赤血球輸血の代用としての酸素キャリア oxygen carriers as alternatives to red cell transfusion
5. 高炭酸ガス血症患者における酸素の使用 use of oxygen in patients with hypercapnia

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