The pressure exerted by a gas on the walls of its container is caused by
- A. the weight of the gas molecules
- B. collisions of the molecules with the walls
- C. attraction between molecules and the walls
- D. the chemical reaction of the gas with the walls
Explanation
Each collision delivers a small impulse, and the enormous number of collisions per second averages out into a steady pressure. Raising the temperature makes the molecules strike harder and more often, which is why pressure rises with temperature at constant volume. Weight contributes negligibly at ordinary scales.
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