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Related Concept Videos

Surface Tension01:24

Surface Tension

Surface tension is defined as the force per unit length (γ) acting along the surface of a liquid. It arises due to strong intermolecular forces of attraction. A molecule located inside the bulk of the liquid is surrounded by other molecules and experiences equal forces in all directions. However, a molecule at the surface experiences unbalanced forces because there are more neighboring molecules below than above. This creates a net inward force that pulls surface molecules toward the interior,...
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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...
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Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
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Pathogens spread from their reservoirs to susceptible hosts through three main routes: contact transmission, vehicle transmission, and vector transmission. Each route involves distinct mechanisms of transfer.Contact TransmissionThis category includes direct contact, indirect contact, and droplet transmission:Direct contact involves immediate physical interaction between individuals—such as a handshake—which can spread pathogens like Streptococcus pyogenes, the bacterium responsible for...
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Related Experiment Video

Updated: Jun 18, 2026

High Throughput Analysis of Liquid Droplet Impacts
09:00

High Throughput Analysis of Liquid Droplet Impacts

Published on: March 6, 2020

Long time spreading of a microdroplet on a smooth solid surface.

Ralf Brunner1, Izhak Etsion, Frank E Talke

  • 1University of California, San Diego, La Jolla, California 92093-0401, USA. rbrunner@ucsd.edu

Langmuir : the ACS Journal of Surfaces and Colloids
|November 13, 2009
PubMed
Summary

Microdroplet spreading on surfaces was studied. A final film thickness was found to be independent of initial droplet volume and spreading dynamics, matching theoretical predictions.

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Area of Science:

  • Fluid dynamics
  • Surface science
  • Materials science

Background:

  • Understanding microdroplet behavior is crucial for applications in printing, coating, and microfluidics.
  • Previous studies have focused on initial spreading dynamics, with less attention paid to the final equilibrium state.

Purpose of the Study:

  • To experimentally investigate the long-term spreading of microdroplets on a smooth solid surface.
  • To determine the factors influencing the final film thickness of microdroplets.
  • To develop and validate a theoretical model for predicting the final microdroplet film thickness.

Main Methods:

  • Experimental observation of microdroplet spreading over time on a smooth solid surface.
  • Derivation of an empirical expression for spreading area as a function of time.
  • Development of a theoretical model incorporating volume conservation and minimum energy principles.

Main Results:

  • An empirical relationship for microdroplet spreading area over time was established, indicating a cessation of spreading at a final area.
  • The mean film thickness at this final area was found to be invariant with respect to the initial droplet volume and spreading dynamics.
  • The theoretical model accurately predicted the final uniform film thickness, showing good agreement with experimental data.

Conclusions:

  • Microdroplet spreading on smooth surfaces reaches a predictable final film thickness.
  • This final thickness is governed by fundamental physical principles (volume conservation, minimum energy) rather than initial conditions.
  • The developed theoretical model provides a reliable method for predicting this equilibrium state.