what is surface tension
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the tension of the surface film of a liquid caused by the attraction of the particles in the surface layer by the bulk of the liquid, which tends to minimize surface area.
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Surface tension is measured as the energy required to increase the surface area of a liquid by a unit of area. The surface tension of a liquid results from an imbalance of intermolecular attractive forces, the cohesive forces between molecules:
A molecule in the bulk liquid experiences cohesive forces with other molecules in all directions.
A molecule at the surface of a liquid experiences only net inward cohesive forces.
The surface tension of water is 72 dynes/cm at 25°C .
A molecule in the bulk liquid experiences cohesive forces with other molecules in all directions.
A molecule at the surface of a liquid experiences only net inward cohesive forces.
The surface tension of water is 72 dynes/cm at 25°C .
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