11th Class Physics Mechanical Properties of Fluids / तरलों के यांत्रिक गुण Question Bank Mechanical Properties of Fluids Conceptual Problems

  • question_answer
    Water gets depressed in a glass tube whose inner surface is coated with wax. Why?

    Answer:

                    The angle of contact between water and wax is obtuse. So \[\cos \theta \]is negative and hence capillary rise: \[h=2\sigma \cos \theta /r\rho g\]is also negative. That is why water gets depressed.


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