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Related Concept Videos

Capillary Exchange01:28

Capillary Exchange

The cardiovascular system's chief role is to disseminate gases, nutrients, waste, and other substances to the body's cells. Small molecules like gases, lipids, and lipid-soluble substances directly diffuse through capillary wall endothelial cell membranes. Glucose, amino acids, and ions, including sodium, potassium, calcium, and chloride, use transporters for facilitated diffusion via membrane-specific channels. Glucose, ions, and bigger molecules may also pass through intercellular clefts.
Pressure Variation in a Fluid at Rest01:11

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 pressure...
Glomerular Filtration: Net Filtration Pressure01:26

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 tubule,...
Capillarity in Fluid01:19

Capillarity in Fluid

Capillarity describes the movement of liquid in small spaces without external forces acting on it. The capillarity is driven by surface tension and adhesive interactions between the liquid and surrounding solid surfaces. This effect is often seen in narrow tubes, porous materials, and fine particles.
Surface tension is crucial to capillarity. It results from cohesive forces between liquid molecules at the liquid-air boundary, forming a skin that resists external forces. When the capillary tube...
Pressure of Fluids01:14

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...
Measurement of Fluid Pressure01:16

Measurement of Fluid Pressure

Fluid pressure is commonly measured using devices called manometers, which rely on liquid columns to indicate pressure differences. The height of a liquid column in a manometer reflects the pressure exerted by the fluid, providing a simple yet effective means of measurement. Different types of manometers serve specific purposes based on their configurations and the type of fluids involved.
A basic form of manometer is the piezometer, a vertical tube open at the top and filled with the same...

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Related Experiment Video

Updated: Jun 14, 2026

Reduced-gravity Environment Hardware Demonstrations of a Prototype Miniaturized Flow Cytometer and Companion Microfluidic Mixing Technology
13:59

Reduced-gravity Environment Hardware Demonstrations of a Prototype Miniaturized Flow Cytometer and Companion Microfluidic Mixing Technology

Published on: November 13, 2014

Capillary pressure studies under low gravity conditions.

V I Kovalchuk1, F Ravera, L Liggieri

  • 1Institute of Biocolloid Chemistry, Vernadsky str. 42, 03142 Kiev, Ukraine. Vladim@koval.kiev.ua

Advances in Colloid and Interface Science
|March 31, 2010
PubMed
Summary
This summary is machine-generated.

Capillary pressure tensiometry is crucial for studying short-time adsorption and high-frequency relaxations at liquid interfaces. Microgravity experiments overcome limitations of Earth-based studies, revealing surfactant roles under dynamic conditions.

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Related Experiment Videos

Last Updated: Jun 14, 2026

Reduced-gravity Environment Hardware Demonstrations of a Prototype Miniaturized Flow Cytometer and Companion Microfluidic Mixing Technology
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Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces
08:05

Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces

Published on: September 9, 2022

Area of Science:

  • Surface science
  • Fluid dynamics
  • Materials science

Background:

  • Understanding short-time adsorption and high-frequency relaxations at liquid interfaces requires specialized techniques.
  • Capillary pressure tensiometry is a key method, but Earth's gravity imposes limitations like convection and interfacial deformation.

Purpose of the Study:

  • To provide an overview of experimental tools for short-time and high-frequency investigations of liquid drops and bubbles under microgravity.
  • To discuss the theoretical basis and limitations of these methods on Earth and in microgravity.

Main Methods:

  • Overview of state-of-the-art experimental tools for microgravity studies.
  • Theoretical basis of capillary pressure tensiometry.
  • Analysis of experimental data from space shuttle missions.

Main Results:

  • Microgravity conditions enable advanced studies of dynamic interfacial phenomena.
  • Surfactant behavior under highly dynamic conditions was investigated.
  • Data from two space shuttle missions (Discovery 1998, Columbia 2003) were analyzed.

Conclusions:

  • Microgravity experiments significantly enhance the study of dynamic interfacial phenomena.
  • Capillary pressure tensiometry in microgravity overcomes Earth-based limitations.
  • These studies provide crucial insights into surfactant roles in dynamic systems.