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Effect of Temperature and Salinity on Surface Tension of Water

tipo de documento Ciències de la Terra i Medi ambient - Experiment/Pràctica

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Surface tension is a property of liquids. Liquids have a limited ability – called surface tension - to resist an external force. For example, when a liquid forms a lens-shaped meniscus in a gradeuated cylinder, the surface tension of the liquid is resisting the force of gravity. Because of surface tension, we observe objects float on liquids and insects walk on the surface of lakes, even though they may be far denser than the liquid. Surface tension is the product of Van der Waal forces. Since Van der Waal forces exist between the molecules of a single substance such as water, they are called inter-molecular forces. This force causes the molecules on the surface of a liquid to cling together, almost as if they were acting like a sheet of plastic wrap.How do temperature and salinity affect surface tension?

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