Pressure of an ideal gas
- Created by: boggleme
- Created on: 03-12-14 16:29
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- Pressure
- In a box...
- If particle velocities increase, the force at which they hit the wall at increases so pressure increases
- If the number of particles increases, the total force acting on the wall per second increases so pressure increases
- If volume decreases then the particles have less distance to travel before they collide with the wall again. The total force increases so pressure increases
- Particles travel in random directions but for simplicity it can be said that a third of all particles are travelling in any one dimension (x, y, z)
- pV=Nm*mean square speed/3
- root mean square speed is the speed of an average particle
- Assuming...
- gas contains a large number of particles
- particles move rapidly and randomly
- motion of particles follow Newton's laws
- collisions are perfectly elastic (no energy or momentum is lost)
- no attractive forces between particles
- any forces during collisions are instantaneous
- particles have a negligible volume compared to that of the container
- random walk assumes all particles start somewhere, move N steps in random directions and ends up somewhere else
- distance moved = the root of the number of steps taken
- In a box...
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