Pressure Molecular Origin
Pressure of gas arises due to:
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About This Question
- Subject
- physics
- Chapter
- kinetic theory of gases
- Topic
- pressure molecular origin
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Molecular collisions with walls
According to the Kinetic Theory of Gases, gas pressure is a macroscopic manifestation of microscopic collisions.
- Momentum Change: When a gas molecule of mass m and velocity vx hits a wall and rebounds elastically, its momentum changes by Δp=m(−vx)−m(vx)=−2mvx.
- Impulse: The wall exerts a force to cause this momentum change. By Newton's Third Law, the molecule exerts an equal and opposite force on the wall.
- Averaging: The constant bombardment by billions of molecules creates a steady average force.
- Pressure: Pressure is defined as this average force divided by the area of the wall (P=F/A).
This easy difficulty physics question is from the chapter kinetic theory of gases, covering the topic of pressure molecular origin. It appeared in the 2025 exam.
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