Partial Pressure
Partial Pressure - Related Videos
03:03
Mixtures of Gases: Dalton's Law of Partial Pressures and Mole Fractions
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2020
Unless individual gases chemically react with each other, the individual gases in a mixture of gases do not affect each other’s pressure. Each gas in a mixture exerts the same pressure that it would exert if it were present alone in the container. The pressure exerted by each individual gas in a mixture is called its partial pressure. This means that in a mixture containing three different gases A, B, and C, if PA is the partial pressure of gas A; PB is the partial pressure of gas B; PC is the...
01:11
Dalton's Law of Partial Pressure
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2023
The partial pressure of a gas is a measure of the thermodynamic activity of the gas's molecules. The pressure that a gas would create if it occupied the total volume available is called the gas's partial pressure. If two or more gases are mixed together in a container, the molecules move randomly and collide with each other, causing them to reach thermal equilibrium. When the gases have the same temperature, their molecules have the same average kinetic energy. Thus, each gas obeys the ideal...
07:26
Synthesis and Microdiffraction at Extreme Pressures and Temperatures
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Cited by 5 •
2013
The laser heated diamond anvil cell combined with synchrotron micro-diffraction techniques allows researchers to explore the nature and properties of new phases of matter at extreme pressure and temperature (PT) conditions. Heterogeneous samples can be characterized in situ under high pressure by 2D mapping and combined powder, single-crystal and multigrain diffraction approaches.
02:34
Vapor Pressure
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2020
When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules move randomly about, they will occasionally collide with the surface of the condensed phase, and in some cases, these collisions will result in the molecules re-entering the condensed phase. The change from the gas phase to the liquid is called condensation. When the rate of condensation becomes equal to the rate of vaporization, neither the amount of the liquid nor the amount of the vapor...
08:34
Robot-assisted Partial Splenectomy
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2026
This protocol describes a robot-assisted partial splenectomy for a benign splenic tumor. The robotic approach optimizes spleen preservation by enhancing surgical precision, minimizing blood loss, and improving postoperative outcomes. Key surgical steps include meticulous splenic hilum dissection, selective vascular ligation, intraoperative ultrasonography, and controlled parenchymal transection.
FAQs
Determine the component’s mole fraction by dividing its amount of gas by the total amount in the mixture, then multiply that fraction by the total pressure. For example, a component representing one quarter of the mixture contributes one quarter of the total pressure under ideal-gas conditions. This calculation connects measured composition with pressure contributions in engineering analyses.
Under ideal-gas conditions, every gas component is treated as if it occupied the container by itself at the mixture’s temperature and volume. Because pressure depends on the amount of gas under those shared conditions, a component’s mole fraction scales its contribution directly. This relationship allows engineers to analyze mixtures without treating each constituent as a separate container system.
Dalton’s law provides a consistency check by requiring the component partial pressures to add to the mixture’s total pressure. After calculating the contribution of each gas, engineers can sum the results and compare that value with the stated total. A mismatch indicates an error in composition, pressure conversion, arithmetic, or the assumptions used for the analysis.
The stated relationship between mole fraction and partial pressure applies under ideal-gas conditions. Therefore, an analysis should first determine whether treating each component as an independently behaving gas is appropriate for the engineering situation. When that assumption is adopted, the resulting values support mixture calculations involving composition, diffusion, combustion, and other gas-phase processes described by the model.
First identify the mixture’s total pressure and the amount or mole fraction of every component. Next, calculate each mole fraction from the component amount and total amount, then multiply each fraction by the total pressure. Finally, add all calculated contributions and verify that their sum matches the total pressure before using the results in design or evaluation.
In combustion systems, component pressures help engineers evaluate gas composition and the conditions associated with reacting mixtures. In ventilation, they help characterize how individual gases contribute within an overall gas environment. These analyses support system design and evaluation by separating the behavior of each constituent from the mixture’s total pressure, rather than relying only on the overall pressure value.
Gas separation processes depend on distinguishing the contributions of individual components within a mixture, while vapor-liquid operations require attention to gas composition and phase equilibrium. Partial-pressure calculations provide the component-level pressure information needed for these evaluations. Engineers can therefore relate mixture composition to separation behavior and to conditions where gases and liquids interact.
Pressurized equipment contains mixtures whose individual gases each contribute to the total pressure. Calculating those contributions helps engineers evaluate the specified gas composition alongside the overall pressure during design and operation. This component-level view is also relevant to safe operating conditions because it identifies how the mixture’s constituents participate in the pressure environment rather than treating the contents as composition-free gas.