Pressure Volume Relationship
Pressure Volume Relationship - Related Videos
07:38
Cardiac Catheterization in Mice to Measure the Pressure Volume Relationship: Investigating the Bowditch Effect
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Cited by 10 •
2015
This article describes the measurement of murine left ventricular function via pressure/volume analysis at different heart rates.
09:15
Measuring Pressure Volume Loops in the Mouse
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Cited by 16 •
2016
This manuscript describes a detailed protocol for the collection of pressure-volume data from the mouse.
01:24
Pressure Relationships in Thoracic Cavity
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2024
Breathing, otherwise known as pulmonary ventilation, is the process of air movement into and out of the lungs. The main mechanisms propelling pulmonary ventilation are atmospheric pressure (Patm), intra-pulmonary (Ppul ) or intra-alveolar pressure (Palv) within the alveoli, and intrapleural pressure (Pip) within the pleural cavity. Breathing Mechanisms Both intra-alveolar and intrapleural pressures rely on specific lung properties. The ability to breathe—allowing air to enter the lungs during...
02:32
Le Chatelier's Principle: Changing Volume (Pressure)
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2020
For gas-phase equilibria, changes in the concentrations of reactants and products can occur with altered volume and pressure. The partial pressure, P, of an ideal gas is proportional to its molar concentration, M. So changes in the partial pressures of any reactant or product are essentially changes in concentrations; therefore, these changes yield the same effects on equilibria. Aside from adding or removing reactants or products, the pressures (concentrations) of species in a gas-phase...
09:49
Measurement of the Pressure-volume Curve in Mouse Lungs
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Cited by 47 •
2015
Here we present a protocol to simply and reliably measure the lung pressure-volume curve in mice, showing that it is sufficiently sensitive to detect phenotypic parenchymal changes in two common lung pathologies, pulmonary fibrosis and emphysema. This metric provides a means to quantify the lung’s structural changes with developing pathology.
FAQs
Compression places the same amount of gas into a smaller volume, so particles reach the container walls more frequently. This increases the frequency of collisions responsible for pressure. Conversely, expansion gives the particles more space and reduces collision frequency, producing lower pressure. The particle-collision explanation connects the observed relationship to molecular behavior.
Boyle’s law describes pressure and volume under controlled conditions: a fixed amount of gas and constant temperature. Holding these conditions steady isolates the pressure-volume change rather than mixing it with changes caused by heating, cooling, or adding or removing gas. This makes the inverse relationship useful for predicting the behavior of a defined gaseous system.
A pressure-volume diagram provides a visual way to examine how pressure changes as volume changes. For a fixed amount of gas at constant temperature, it represents the inverse pattern expected from Boyle’s law: smaller volumes correspond to higher pressures, while larger volumes correspond to lower pressures. Such diagrams help scientists analyze and compare gas states.
The pressure-volume relationship supplies a foundational case for using the ideal gas law. It focuses attention on how two measurable properties of a gas respond to one another when the amount of gas and temperature are held constant. Studying this controlled relationship helps scientists extend their analysis to broader changes in gaseous systems.
A basic investigation changes the volume occupied by a fixed amount of gas while maintaining constant temperature, then examines the corresponding pressure changes. Measurements can be organized to compare different gas states and evaluated with a pressure-volume diagram. Keeping the relevant conditions controlled allows the observed pattern to be interpreted using Boyle’s law.
The relationship helps explain operations involving syringes, pumps, and respiratory systems. In each case, changing the available volume can alter gas pressure through changes in particle-wall collision frequency. It also supports laboratory gas measurements by providing a framework for anticipating how pressure should respond when a gaseous space is compressed or expanded.