Surface tension And Capillarity

Example 3:

Compare the capillary rise of water and mercury in a glass tube of 2 mm diameter at 200 C .Given that the surface tension of water and mercury at 200 C are 0.0736 N/m and 0.051N/m respectively. Contact angles of water and mercury are 00 and 1300 respectively.

Solution :

Given data: Surface tension of water, sw = 0.0736 N/m
                    And surface tension mercury, sm =0.051N/m

                  Capillary rise in a tube
                 For mercury and

                               

                Note that the negative sign indicates capillary depression.
                For water specific weight and
               The

  Answer: -        15mm rise and 6.68mm depression.

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