9th Class Science Matter in Our Surroundings Question Bank Matter in our Surroundings

  • question_answer
    When the vapour pressure of a liquid is equal to the atmospheric pressure, what happens to the liquid?

    A)  The liquid freezes.

    B)  The liquid evaporates.

    C)  The liquid boils.  

    D)  The liquid does not undergo any change.

    Correct Answer: C

    Solution :

     The boiling of a liquid depends on its vapour pressure and the atmospheric pressure around it. When the vapour pressure of a liquid becomes equal to the atmospheric pressure of the liquid, then the vapour formed above the liquid rises to the surface of the liquid in the form of bubbles and escapes into the air. This state of liquid is called boiling.


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