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Pressure of Fluids

Pressure of Fluids

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 skin...

Concept of Pressure at a Point

Concept of Pressure at a Point

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.
In a fluid at rest, pressure acts equally in...

Fluid Pressure

Fluid Pressure

In mechanical engineering, fluid pressure plays a critical role in designing systems that utilize liquid flow, such as hydraulic systems, pumps, and valves. When designing these systems, engineers must ensure they can withstand the forces created by fluid pressure to avoid damage or failure.
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Pressure Relationships in Thoracic Cavity

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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.
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Hydrostatic Pressure Force on a Plane Surface

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When a plane surface is submerged in a fluid, hydrostatic forces develop on the surface due to the fluid's pressure. For horizontal surfaces, the pressure exerted by the fluid is uniform because the depth remains constant. The resultant force is determined by the pressure at the given depth multiplied by the area of the surface, and it acts through the centroid of the surface. For vertical surfaces, the pressure varies with depth, increasing as the distance from the fluid's free surface...

Application of Pascal's Law

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Pascal's experimentally proven observations—that a change in pressure applied to an enclosed fluid is transmitted undiminished throughout the fluid and to the walls of its container—provide the foundations for hydraulics, one of the most important developments in modern mechanical technology.
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Related Experiment Video

Updated: Jul 12, 2026

Microfluidic Fabrication Techniques for High-Pressure Testing of Microscale Supercritical CO2 Foam Transport in Fractured Unconventional Reservoirs

Microfluidic Fabrication Techniques for High-Pressure Testing of Microscale Supercritical CO₂ Foam Transport in Fractured Unconventional Reservoirs

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High pressures on small areas.

A L Ruoff, J Wanagel

Science (New York, N.Y.)

|December 9, 1977

Summary

Researchers used spherical diamond indentors to press against a diamond flat, achieving very high pressures on small areas using Hertz contact theory.

Area of Science:

Materials Science
Tribology
Nanotechnology

Background:

Understanding material behavior under extreme pressure is crucial for developing advanced materials.
Diamond's unique properties make it a key material in high-pressure research.

Purpose of the Study:

To investigate the pressures generated when small diamond indentors contact a diamond flat.
To explore the application of Hertz contact theory in extreme pressure scenarios.

Main Methods:

Utilizing small diamond indentors with spherical tips.
Applying controlled pressure against a polished diamond flat.
Calculating contact pressures using Hertz contact theory.

Main Results:

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High-Sensitivity Nuclear Magnetic Resonance at Giga-Pascal Pressures: A New Tool for Probing Electronic and Chemical Properties of Condensed Matter under Extreme Conditions

High-Sensitivity Nuclear Magnetic Resonance at Giga-Pascal Pressures: A New Tool for Probing Electronic and Chemical Properties of Condensed Matter under Extreme Conditions

Published on: October 10, 2014

$Synthesis and Microdiffraction at Extreme Pressures and Temperatures$

Synthesis and Microdiffraction at Extreme Pressures and Temperatures

Published on: October 7, 2013

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Last Updated: Jul 12, 2026

Microfluidic Fabrication Techniques for High-Pressure Testing of Microscale Supercritical CO2 Foam Transport in Fractured Unconventional Reservoirs

Microfluidic Fabrication Techniques for High-Pressure Testing of Microscale Supercritical CO₂ Foam Transport in Fractured Unconventional Reservoirs

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High-Sensitivity Nuclear Magnetic Resonance at Giga-Pascal Pressures: A New Tool for Probing Electronic and Chemical Properties of Condensed Matter under Extreme Conditions

High-Sensitivity Nuclear Magnetic Resonance at Giga-Pascal Pressures: A New Tool for Probing Electronic and Chemical Properties of Condensed Matter under Extreme Conditions

Published on: October 10, 2014

$Synthesis and Microdiffraction at Extreme Pressures and Temperatures$

Synthesis and Microdiffraction at Extreme Pressures and Temperatures

Published on: October 7, 2013

Successfully achieved very high pressures concentrated on small contact areas.

Demonstrated the feasibility of generating extreme pressures in a controlled laboratory setting.

Validated the application of Hertz contact theory for these high-pressure conditions.

Conclusions:

Small-scale indentation experiments can generate significant pressures.
Hertz contact theory provides a reliable method for calculating these high pressures.
This technique offers a pathway for studying material properties under extreme stress.