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Related Concept Videos

Pressure Variation in a Fluid at Rest01:11

Pressure Variation in a Fluid at Rest

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In a fluid at rest, the pressure at any point beneath the fluid surface depends solely on the depth, not on the container's shape or size. This principle, known as hydrostatic pressure, arises because, in stationary fluids, there is no acceleration, meaning the forces within the fluid balance out. Only vertical forces, caused by the weight of the fluid above, contribute to pressure changes with depth.
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There are many examples of pressure in fluids in everyday life, such as in relation to blood (high or low blood pressure) and in relation to weather (high- and low-pressure weather systems). A given force can have a significantly different effect, depending on the area over which the force is exerted. For instance, a force applied to an area of 1 mm2 has a pressure that is 100 times greater than the same force applied to an area of 1 cm2. That's why a sharp needle is able to poke through...
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The concept of pressure at a point in a fluid establishes that pressure within a fluid is uniform in all directions at a specific location. This uniformity occurs because fluid molecules exert force evenly across any point due to their random motion and continuous collisions within the fluid. Pressure at a point is determined by the surrounding fluid molecules and is influenced by factors like depth and density, rather than by shape or orientation.
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Sound waves, which are longitudinal waves, can be modeled as the displacement amplitude varying as a function of the spatial and temporal coordinates. As a column of the medium is displaced, its successive columns are also displaced. As the successive displacements differ relatively, a pressure difference with the surrounding pressure is created. The gauge pressure varies across the medium.
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The basic equation for a pressure field in fluid mechanics captures the balance of forces within any segment of fluid, providing a foundational understanding of how pressure changes within fluids under various forces. Generally, two main types of forces act on any part of a fluid: surface forces and body forces. Surface forces arise from pressure differences across points within the fluid, which result in net forces that can vary depending on the local pressure gradient. Body forces, on the...
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Synthesis and Microdiffraction at Extreme Pressures and Temperatures
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Ultrafast dynamics under high-pressure.

Hongyu Tu1, Lingyun Pan1, Hongjian Qi1

  • 1State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|March 10, 2023
PubMed
Summary
This summary is machine-generated.

High-pressure studies reveal how material properties change under extreme conditions. Ultrafast spectroscopy combined with high pressure offers insights into material dynamics, aiding in new applications.

Keywords:
femtosecondhigh-pressuretime-resolvedultrafast dynamics

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Spectroscopy

Background:

  • High pressure is a mechanical method to control material structure and interactions.
  • Material properties' changes under pressure are crucial for understanding fundamental characteristics.
  • Ultrafast spectroscopy is vital for investigating dynamic processes in materials.

Purpose of the Study:

  • To review recent advancements in ultrafast dynamics under high pressure.
  • To explore new phenomena and mechanisms observed in materials subjected to high pressure.
  • To detail the principles and applications of in situ high-pressure ultrafast dynamics probing technology.

Main Methods:

  • Utilizing high-pressure techniques to alter material properties.
  • Employing ultrafast spectroscopy (nanosecond to femtosecond scale) to probe dynamic processes.
  • Reviewing existing literature on in situ high-pressure ultrafast dynamics studies.

Main Results:

  • High pressure influences wavefunction delocalization and material dynamics.
  • Combined high-pressure and ultrafast spectroscopy reveals effects on energy transfer, charge transfer, and Auger recombination.
  • New phenomena and mechanisms in various material systems under high pressure have been observed.

Conclusions:

  • In situ high-pressure ultrafast dynamics is a powerful approach for materials investigation.
  • This technique provides essential data for understanding material behavior and applications.
  • Future research outlook for in situ high-pressure ultrafast dynamics is promising.