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Forces of Cohesion/ Adhesion

  • Page ID
    221948
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    Chemical Concepts Demonstrated

    • Existence of and differences between the forces of adhesion and cohesion
    • Surface tension

    Demonstration

    A 50:50 mixture of absolute ethanol and DI water is poured into a VERY clean glass and projected on the overhead. wine.gif

    Observations

    The alcohol/water vapor collects above the liquid in the goblet forming a ring where the liquid and vapor intersect.

    Explanation

    The force of cohesion is defined as the force of attraction between molecules of the same substance. The force of adhesion is defined as the force of attraction between different substances, such as glass and water.

    The ring is formed by the alcohol/water mixture climbing the walls of the wine goblet. When the force of adhesion between a liquid and the walls of its container is a significant fraction of the force of cohesion between the particles in the liquid, the liquid will "wet" the walls of the container.

    Contributors


    Forces of Cohesion/ Adhesion is shared under a not declared license and was authored, remixed, and/or curated by LibreTexts.

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