Surface tension in liquids is caused by
forces between the molecules of the liquid.
forces are called cohesive forces.
example, has polar molecules. This means that
each molecule has a slightly negative charge at
one end and a slightly positive charge at the
other. The negatively charged end of one molecule
is attracted to the positively charged end of
another molecule, and the two ends
When you put liquid in a
beaker, you probably notice that the sides of the
liquid sit up kind of high on the sides of the
beaker, forming what is called a meniscus.
happens because of an attraction between the glass
and the liquid molecules. This attraction is
called an adhesive force because it occurs
two unlike molecules. The adhesive force between
the glass and the liquid is greater than the
cohesive force between the liquid molecules;
therefore, the liquid is pulled up the sides of
the beaker toward the glass.
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