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# why doesn't volume affect the boltzmann curve watch

1. why doesn't volume affect the boltzmann curve
2. (Original post by esmeralda123)
why doesn't volume affect the boltzmann curve
If you look at the axis typically used, i.e. Proportion of molecules with Energy (E) and Energy (E). Volume wouldn't affect it. There would be more successful collisions per unit of time, but the velocity wouldn't change. Boltzmann distribution shows the number of molecules at a certain energy and hence velocity. Volume wouldn't affect velocity
3. (Original post by Kyber Ninja)
If you look at the axis typically used, i.e. Proportion of molecules with Energy (E) and Energy (E). Volume wouldn't affect it. There would be more successful collisions per unit of time, but the velocity wouldn't change. Boltzmann distribution shows the number of molecules at a certain energy and hence velocity. Volume wouldn't affect velocity
what do you mean by velocity?
4. (Original post by esmeralda123)
what do you mean by velocity?
Energy = Kinetic Energy

Kinect energy is proportional to velocity for these small molecules
5. (Original post by esmeralda123)
why doesn't volume affect the boltzmann curve
The key is that the average kinetic energy of a particle is directly proportional to the absolute temperature AND that the statistical distribution of energy is given by the Maxwell Boltzmann equation.

Increasing number of particles cannot affect either of the above.
6. (Original post by charco)
The key is that the average kinetic energy of a particle is directly proportional to the absolute temperature AND that the statistical distribution of energy is given by the Maxwell Boltzmann equation.

Increasing number of particles cannot affect either of the above.
Just a query, if the pressure is vastly increased, won't there be more friction, hence a higher temperature? Hence a higher average kinetic energy? Or is this a cancelling out effect since other particles are being sped up and others slowed down by this?
7. (Original post by Kyber Ninja)
Just a query, if the pressure is vastly increased, won't there be more friction, hence a higher temperature? Hence a higher average kinetic energy? Or is this a cancelling out effect since other particles are being sped up and others slowed down by this?
According to the ideal gas law, PV = nRT, there are only 3 ways to increase the pressure.

1. Decrease the volume.
2. Increase the number of moles of gas
3. Increase the temperature

1. Has no effect on T, as PV = constant
2. Has no effect on T, as n is proportional to P
3. Has an effect on T, obviously

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