Partial Pressure

In a mixture of ideal gases, each gas has a partial pressure which is the pressure that the gas would have if it alone occupied the volume of the mixture at the same temperature. The total pressure of a gas mixture is the sum of the partial pressures of each individual gas in the mixture.

The partial pressure of a gas is a measure of thermodynamic activity of the gas's molecules. Gases dissolve, diffuse, and react according to their partial pressures, and not according to their concentrations in gas mixtures or liquids.

This general property of gases is also true of chemical reactions of gases in biology. For example, the necessary amount of oxygen for human respiration, and the amount that is toxic, is set by the partial pressure of oxygen alone. This is true across a very wide range of different concentrations of oxygen present in various inhaled breathing gases, or dissolved in blood.

Read more about Partial PressureDalton's Law of Partial Pressures, Ideal Gas Mixtures, Partial Volume (Amagat's Law of Additive Volume), Vapor Pressure, Equilibrium Constants of Reactions Involving Gas Mixtures, Henry's Law and The Solubility of Gases, Partial Pressure in Diving Breathing Gases, In Medicine

Other articles related to "partial pressure, partial pressures, pressures, pressure":

Partial Pressure - In Medicine
... The partial pressures of particularly oxygen and carbon dioxide are important parameters in tests of arterial blood gases, but can also be measured in, for example, cerebrospinal fluid ... blood gas Venous blood gas Cerebrospinal fluid Alveolar pulmonary gas pressures kPa 11–13 4.0–5.3 5.3–5.9 14.2 mmHg 75–100 30–40 40–44 107 kPa 4.7 ...
Decompression Algorithms - Decompression Equipment - Providing Gases To Accelerate Decompression
... Reducing the partial pressure of the inert gas component of the breathing mixture will accelerate decompression as the concentration gradient will be greater for a given depth ... This is usually achieved by increasing the partial pressure of oxygen in the breathing gas, as substituting a different inert gas may have counterdiffusion complications due to differing rates of ... Partial pressure of oxygen is usually limited to 1.6 bar during in water decompression, but can be up to 2.2 bar when using the US Navy tables for surface decompression ...
Electro-galvanic Fuel Cell
... The current produced is proportional to the concentration (partial pressure) of oxygen present ... rebreathers to monitor the oxygen partial pressure during the dive ... The partial pressure of oxygen in diving chambers and surface supplied breathing gas mixtures can also be monitored using these cells ...
Glossary Of Fuel Cell Terms - P - Partial Pressure
... In a mixture of ideal gases, each gas has a partial pressure which is the pressure which the gas would have if it alone occupied the volume ... The total pressure of a gas mixture is the sum of the partial pressures of each individual gas in the mixture ...
Arterial Blood Gas Sampling - Parameters and Reference Ranges
... Arterial oxygen partial pressure (PaO2) 11-13 kPa or 75-100 mmHg A low PaO2 indicates that the patient is not oxygenating properly, and is hypoxemic ... Arterial carbon dioxide partial pressure (PaCO2) 4.7-6.0 kPa or 35-45 mmHg The carbon dioxide partial pressure (PaCO2) is an indicator of CO2 production and elimination ...

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