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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.
According to Pascal's law, a fluid at rest will generate equal pressure in all directions. This pressure is measured as a force per unit area, and its magnitude depends on the fluid's specific...

Pressure Variation in a Fluid at Rest

Pressure Variation in a Fluid at Rest

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.
When measuring pressure at two different levels within the fluid, the difference in...

Glomerular Filtration: Net Filtration Pressure

Glomerular Filtration: Net Filtration Pressure

Glomerular filtration, a key process in the kidneys, is regulated by three main pressures: Glomerular blood hydrostatic pressure (GBHP), Capsular hydrostatic pressure (CHP), and Blood colloid osmotic pressure (BCOP).
GBHP, with an average value of 55 mmHg, promotes filtration by pushing water and solutes through the filtration membrane. This is balanced by two opposing forces: CHP, a "back pressure" exerted against the filtration membrane by fluid already in the capsular space and renal...

Fluid Movement Between Compartments

Fluid Movement Between Compartments

The force applied by fluids against a surface, known as hydrostatic pressure, initiates the transfer of fluid among different compartments. Within our blood vessels, the blood's hydrostatic pressure is a result of the heart's pumping action. At the arteriolar end of capillaries, hydrostatic pressure (capillary blood pressure) exceeds the opposing colloid osmotic pressure created primarily by plasma proteins like albumin. This discrepancy in pressure propels plasma and nutrients from the...

Hydrostatic Pressure Force on a Curved Surface

Hydrostatic Pressure Force on a Curved Surface

Hydrostatic pressure on curved surfaces is a fundamental concept in fluid mechanics with broad applications in the civil engineering field. When fluid is in contact with a curved surface, as in a reservoir, dam, or storage tank, it exerts pressure that varies in magnitude and direction along the curved surface. To assess the total hydrostatic force exerted by the fluid on a curved structure, engineers typically isolate the fluid volume adjacent to the surface and analyze the forces acting on...

Cerebrospinal Fluid

Cerebrospinal Fluid

Cerebrospinal fluid (CSF) is a colorless liquid that flows around the brain and the spinal cord, playing a vital role in the protection, support, and overall function of the central nervous system (CNS). CSF production, circulation, and absorption are tightly regulated processes essential for the brain and spinal cord to function properly.
CSF Production
CSF is produced mainly in the choroid plexus, a network of capillaries and ependymal cells located within the ventricular system of the brain....

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Related Experiment Video

Updated: Apr 12, 2026

Modeling Posthemorrhagic Hydrocephalus of Prematurity in Rats

Modeling Posthemorrhagic Hydrocephalus of Prematurity in Rats

Published on: March 28, 2025

[Normal pressure hydrocephalus].

J M Lieb¹, C Stippich, F J Ahlhelm

¹Abteilung für diagnostische und interventionelle Neuroradiologie, Klinik für Radiologie und Nuklearmedizin, Universitätsspital Basel, Petersgraben 4, 4031, Basel, Schweiz, liebj@uhbs.ch.

|May 10, 2015

Summary

This summary is machine-generated.

Normal pressure hydrocephalus (NPH) is a treatable dementia cause in the elderly. Early diagnosis via imaging and clinical tests, followed by CSF shunting, offers the only effective therapy for NPH.

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A Detailed Protocol for Physiological Parameters Acquisition and Analysis in Neurosurgical Critical Patients

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Last Updated: Apr 12, 2026

Modeling Posthemorrhagic Hydrocephalus of Prematurity in Rats

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Published on: March 28, 2025

Neuronavigation and Laparoscopy Guided Ventriculoperitoneal Shunt Insertion for the Treatment of Hydrocephalus

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Published on: October 14, 2022

A Detailed Protocol for Physiological Parameters Acquisition and Analysis in Neurosurgical Critical Patients

A Detailed Protocol for Physiological Parameters Acquisition and Analysis in Neurosurgical Critical Patients

Published on: October 17, 2017

Area of Science:

Neurology
Geriatrics
Radiology

Context:

Normal pressure hydrocephalus (NPH) affects the elderly, presenting as a treatable cause of dementia.
Untreated NPH leads to irreversible motor, psychomotor, and cognitive deficits.
Early diagnosis and intervention are crucial due to symptom progression.

Purpose:

To outline the diagnostic approach for Normal Pressure Hydrocephalus (NPH).
To detail standard radiological findings and innovative MRI techniques for NPH evaluation.
To emphasize the importance of clinical and invasive tests for preoperative patient selection.

Summary:

Conventional imaging reveals ventriculomegaly and the DESH pattern, differentiating NPH from atrophy.
Specialized MRI techniques assess cerebrospinal fluid (CSF) flow but are not standard diagnostic tools.
Combined diagnostics, including clinical assessment and CSF diversion tests, aid in NPH diagnosis and surgical candidate selection.

Impact:

Ventriculoperitoneal CSF shunting is the sole established successful therapy for NPH.
Accurate diagnosis and timely treatment can prevent irreversible neurological damage.
Understanding NPH pathogenesis and diagnostic criteria improves patient outcomes and quality of life.