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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
    A oil drop on a hot cup of soup spreads over when the temperature of the soup falls. Why?

    Answer:

                    The surface tension of hot water is less than that of oil and hence oil drop does not spread over hot water. When water is cooled, its surface tension decreases. At low temperature, the surface tension of water becomes greater than that of oil and hence oil drop starts spreading over it.


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