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Capillary Exchange

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.

Capillarity in Fluid

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...

Surface Tension, Capillary Action, and Viscosity

Surface Tension, Capillary Action, and Viscosity

Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...

Rise of Liquid in a Capillary Tube

Rise of Liquid in a Capillary Tube

When very thin cylindrical tubes, called capillaries, are dipped in a liquid, the liquid rises or falls in the tube compared to the surrounding liquid. This phenomenon is called capillary action. Capillary action occurs due to the combination of two opposing forces: the cohesive forces of the liquid, which cause it to stick to itself and form a rounded shape, and the adhesive forces between the liquid and the walls of the container, which cause the liquid to be attracted to the container walls.

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 tubule,...

Types of Forces

Types of Forces

In most situations, forces can be grouped into two categories: contact forces and field forces. Contact forces occur as a result of direct physical contact between objects. Field forces, however, act without the necessity of physical contact between objects. They depend on the presence of a "field" in the region of space surrounding the body under consideration. You can think of a field as a property of space that is detectable by the forces it exerts. Scientists think there are only four...

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Related Experiment Video

Updated: Jun 27, 2026

Wicking Tests for Unidirectional Fabrics: Measurements of Capillary Parameters to Evaluate Capillary Pressure in Liquid Composite Molding Processes

Wicking Tests for Unidirectional Fabrics: Measurements of Capillary Parameters to Evaluate Capillary Pressure in Liquid Composite Molding Processes

Published on: January 27, 2017

Normal capillary forces.

Hans-Jürgen Butt¹, Michael Kappl

¹Max-Planck-Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany. butt@mpip-mainz.mpg.de

Advances in Colloid and Interface Science

|November 22, 2008

Summary

This summary is machine-generated.

Capillary forces, attractive forces from liquid menisci between surfaces, are crucial in natural and technical processes. This review quantizes these forces using continuum theory and considers surface roughness and meniscus formation.

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Last Updated: Jun 27, 2026

Wicking Tests for Unidirectional Fabrics: Measurements of Capillary Parameters to Evaluate Capillary Pressure in Liquid Composite Molding Processes

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Fabrication and Visualization of Capillary Bridges in Slit Pore Geometry

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Published on: January 9, 2014

Area of Science:

Surface Science
Colloid and Surface Chemistry
Physics of Soft Matter

Background:

A liquid meniscus between lyophilic solid surfaces generates an attractive capillary force.
Capillary forces arise from capillary condensation or adsorbed liquid accumulation.
These forces often dominate over other surface forces between hydrophilic surfaces under ambient conditions.

Purpose of the Study:

To provide a quantitative description of normal capillary forces using continuum theory.
To extend the understanding of capillary forces to various surface geometries, including irregular ones.
To discuss the influence of surface roughness and the process of meniscus formation.

Main Methods:

Review of continuum theory for quantitative description of capillary forces.
Analysis of capillary forces between spherical surfaces.
Extension of analysis to regular and irregular surfaces, considering surface roughness.

Main Results:

Capillary forces are significant in phenomena like granular material flow and surface friction.
The study provides a framework for understanding capillary forces on different surface types.
The influence of surface roughness on capillary forces is analyzed.

Conclusions:

Capillary forces are a dominant attractive force between lyophilic surfaces, particularly hydrophilic ones.
Continuum theory offers a robust method for quantifying capillary forces.
Further research should explore assumptions, limitations, and future perspectives in capillary force studies.