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QPage 32: Q7: HC Verma: Concepts of Physics - Volume 2 Kinetic Theory of Gases Page 32: Q7 Solution: A gas is kept in a rigid cubical container. If a load of 10 kg…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often think that adding weight on a rigid container increases the gas pressure because the load adds force on the walls. In a truly rigid container the volume is fixed, so the number of molecules and temperature remain unchanged; the gas pressure depends only on molecular kinetic energy, not on external mechanical loads. The load merely adds stress to the container material, not to the gas.

A gas is kept in a rigid cubical container. If a load of 10 kg is put on the top of the container, does the pressure increase?

Step-by-Step Verified Solution

**Answer:** No, the pressure of the gas does not increase. The pressure exerted by a gas on the walls of the container depends only on the molecular motion, not on external mechanical loads. **Step-by-Step Explanation:** Putting a load on top of a rigid container does not change the volume or the molecular motion inside. The pressure of the gas is determined by the collisions of molecules with the walls, which is unchanged. The load simply increases the stress on the container material.

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