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Matter in Our Surroundings — Science STD 9 — Question

CBSE BoardEnglish MediumSTD 9ScienceMatter in Our Surroundings2 Marks
Question
Why does a gas exert pressure?
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Answer

Because of high energy and negligible forces of attraction, the particles of a gas move with high speed in all directions. Thus, the pressure exerted by a gas is due to the constant collisions of the fast moving gas particles against the walls of the container.

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