Partial Pressure

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partial pressure

[′pär·shəl ′presh·ər]
The pressure that would be exerted by one component of a mixture of gases if it were present alone in a container.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Partial Pressure


In a mixture of gases that occupies a certain volume, the partial pressure of each component gas is the pressure the gas would have if it alone occupied the same volume at the same temperature. Dalton’s law states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of the mixture’s components. A gas’s partial pressure determines the course of the processes of diffusion, absorption, and solution of the gas, as well as of the distribution of the gas between two parts of a system where the parts are separated by a partition that is permeable to the gas.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
The Hg partial pressure given in this work is around 6.4 bar whereas [Dakin 1989] obtained a Hg partial pressure of about 4.7 bar which is within the experimental uncertainty.
(10), (11) In fact, [a.sub.M] is far less than unity; thus, the real equilibrium partial pressure P[O.sub.2] equilibrium is much higher than the pressure over pure M and [M.sub.x] [O.sub.y]
The equilibrium between Hb, Hb[O.sub.2], and HbC[O.sub.2] is governed by the partial pressures of [O.sub.2] and C[O.sub.2] in the system and is assumed to occur instantaneously since the gas exchange through the erythrocyte membrane is relatively fast due to its high surface area (Constantine et al., 1965) and, therefore, the Hb[O.sub.2]-Hb-HbC[O.sub.2] equilibrium reflects the chemical composition of the blood culture vial.
Taking into account carried out similar investigations with application of melting in suspension state, which showed impossibility of achieving equilibrium in Zr- N system, such temperature, partial pressure of nitrogen, and duration of molten zirconium soaking in nitrogen were selected that formation of nitrides on the metal surface to be excluded.
where p is gas partial pressure [N/[m.sup.2]], t is time [s], [D.sub.eff] is the effective diffusion coefficient [[m.sup.2]/s], and z is the spatial coordinate [m].
As stated previously, newer Pb[O.sub.2] probes have the ability to measure not only the partial pressure of oxygen but also Pb[CO.sub.2], pH, and temperature.
The concentration of a given gas species in the liquid phase is proportional to its partial pressure or molar concentration in the gas phase (Henry's law).
In addition, pulmonary X-ray, arterial oxygen partial pressure (PaO2), oxyhemoglobin saturation, carbon dioxide partial pressure (PaCO2), oxygenation index (OI), and ratio of arterial/pulmonary oxygen partial pressures (a/AO2) were also compared.
The performance of the nickel-based and the palladium-based FBMR are analyzed by investigating the impact of major operating parameters (reactor pressure, temperature, permeate side hydrogen partial pressure and steam feed rate) on methane conversion and hydrogen yield.
In the first case, time-dependent measurement of precursor density (partial pressure) can provide insight into precursor delivery stability and process parameters affecting the stability.

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