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Related Concept Videos

Precipitation Processes01:12

Precipitation Processes

The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
Precipitation Reactions03:10

Precipitation Reactions

In a precipitation reaction, aqueous solutions of soluble salts react to give an insoluble ionic compound – the precipitate. The reaction occurs when oppositely charged ions in solution overcome their attraction for water and bind to each other, forming a precipitate that separates out from the solution. Since such reactions involve the exchange of ions between ionic compounds in aqueous solution, they are also referred to as double displacement, double replacement, exchange reactions, or...
Precipitation of Ions03:11

Precipitation of Ions

Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
The de Broglie Wavelength02:32

The de Broglie Wavelength

In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
Phase Transitions: Vaporization and Condensation02:39

Phase Transitions: Vaporization and Condensation

The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
Washing, Drying, and Ignition of Precipitates00:52

Washing, Drying, and Ignition of Precipitates

After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...

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Related Experiment Video

Updated: May 27, 2026

Measuring the Interaction Force Between a Droplet and a Super-hydrophobic Substrate by the Optical Lever Method
07:18

Measuring the Interaction Force Between a Droplet and a Super-hydrophobic Substrate by the Optical Lever Method

Published on: June 14, 2019

On the behavior of dew drops.

Martin E R Shanahan1

  • 1Université de Bordeaux, Institut de Mécanique et Ingénierie de Bordeaux (I2M) - UMR, CNRS 5295, Bâtiment A4, 351 Cours de la Libération, 33405 TALENCE Cedex, France. martin.shanahan@u-bordeaux1.fr

Langmuir : the ACS Journal of Surfaces and Colloids
|November 9, 2011
PubMed
Summary

Dew drops randomly form on flat leaves but gather at the pointed tips of conical growths. This study explains the underlying physics behind this dew accumulation phenomenon.

Area of Science:

  • Physics
  • Surface Science
  • Biophysics

Background:

  • Dew formation is a common atmospheric phenomenon.
  • Surface tension and adhesion play critical roles in liquid behavior.
  • Plant surface morphology can influence water droplet distribution.

Purpose of the Study:

  • To investigate the physical mechanisms governing dew drop accumulation on plant structures.
  • To explain why dew drops concentrate on pointed, conical leaf growths rather than flat surfaces.

Main Methods:

  • Observational analysis of dew formation on various leaf types.
  • Application of fluid dynamics principles to model droplet behavior.
  • Analysis of surface tension and contact angle effects on conical surfaces.

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Film Control to Study Contributions of Waves to Droplet Impact Dynamics on Thin Flowing Liquid Films
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Film Control to Study Contributions of Waves to Droplet Impact Dynamics on Thin Flowing Liquid Films

Published on: August 18, 2018

High Throughput Analysis of Liquid Droplet Impacts
09:00

High Throughput Analysis of Liquid Droplet Impacts

Published on: March 6, 2020

Related Experiment Videos

Last Updated: May 27, 2026

Measuring the Interaction Force Between a Droplet and a Super-hydrophobic Substrate by the Optical Lever Method
07:18

Measuring the Interaction Force Between a Droplet and a Super-hydrophobic Substrate by the Optical Lever Method

Published on: June 14, 2019

Film Control to Study Contributions of Waves to Droplet Impact Dynamics on Thin Flowing Liquid Films
07:08

Film Control to Study Contributions of Waves to Droplet Impact Dynamics on Thin Flowing Liquid Films

Published on: August 18, 2018

High Throughput Analysis of Liquid Droplet Impacts
09:00

High Throughput Analysis of Liquid Droplet Impacts

Published on: March 6, 2020

Main Results:

  • Dew drops exhibit preferential accumulation at the apex of conical structures.
  • Surface geometry significantly impacts dew droplet distribution and collection.
  • The phenomenon is driven by a combination of surface tension gradients and geometric引导.

Conclusions:

  • The pointed ends of conical growths act as natural collection points for dew drops.
  • Understanding this physics can inform biomimetic designs for water harvesting.
  • Plant morphology has evolved to optimize water capture through passive physical processes.