we heat a gas at a constant volume, the pressure increases
- increased average kinetic energy of the particles means there are more collsions with the container walls in a period of time (usually per second) and the collsions involve a greater change in momentum.
we heat a gas at constant pressure, the volume increases
- increasing the volume reduces the chance of particles collding with the container walls, opposing the effect of the particles increased kinetic energy
we compress (reduce the volume) a gas at constant temperature, the pressure increases
- a smaller volume increases the likehood of a particle colliding with the container walls.
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