Why water wet glass and mercury does not - Interesting Science Articles

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Saturday, February 1, 2020

Why water wet glass and mercury does not

Why water wet glass and mercury does not ?

Much depends on the adhesive force (that is, the attraction between the fluid and the material surface) and the cohesive force. Another thing is surface tension or surface tension. Surface tension is almost two times higher than water. In mercury, the adhesive force is weaker than the cohesive force. That is, the attraction between mercury molecules is very strong. In comparison, the attraction between the mercury and the glass floor is less. As a result, mercury does not wet glass.
Thermometer
Thermometer

On the other hand, the adhesive force between the water and the glass floor is very strong.

 The cohesive force is less than that. As a result, the water spills over the glass floor and soaks the glass.

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