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

  • question_answer
    According to Bernoulli's theorem, the pressure of water in a horizontal pipe of uniform diameter should remain constant. But actually it goes on decreasing with the increase in length of the pipe. Why?

    Answer:

                    Bernoulli's theorem is valid only for non- viscous liquids. But water is a viscous liquid. A part of the pressure energy of water is used in doing work against the viscous force. So the pressure of water decreases.


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