Explain the following problem using a property of a liquid. Water rises in a straw when inserted in a glass?
Answer:
Capillary action. This is the tendency for a liquid to rise along small areas, due to the adhesion force between the liquid and the straw being stronger than gravity.
It rises in the straw because the atmospheric pressure in the same in the straw as it is outside of it.
If you seal the top end of the straw the water will not rise in it to any extent.
,since the pressure inside the straw will increase as it is submerged.
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