Do ideal gases move at the same speed?

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SUMMARY

Ideal gases possess the same average kinetic energy, but this does not imply that they move at the same speed within a container. According to kinetic molecular theory, the speeds of gas molecules at any given moment exhibit a wide range. The relationship between kinetic energy and particle speed is influenced by the mass of the gas particles; however, for ideal gases with equal kinetic energy, mass does not affect the average speed. This discussion clarifies the misconception that mass can be neglected when considering the behavior of ideal gases.

PREREQUISITES
  • Understanding of kinetic molecular theory
  • Knowledge of average kinetic energy in gases
  • Familiarity with the relationship between mass and velocity
  • Basic principles of gas behavior in physics
NEXT STEPS
  • Study the Maxwell-Boltzmann distribution of molecular speeds
  • Explore the implications of temperature on gas particle speed
  • Learn about the ideal gas law and its applications
  • Investigate the differences between ideal gases and real gases
USEFUL FOR

Students studying physics, particularly those focusing on thermodynamics and gas laws, as well as educators seeking to clarify concepts related to ideal gases and kinetic energy.

Lori
I've learned that ideal gases have the same average kinetic energy, but this doesn't necessarily mean that they have the same speeds within a container..Instead, is it right to say that (according to kinetic molecular theory) that the speed of molecules at an instance is a wide range of speeds?
 
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I moved the thread to our homework section.
Lori said:
I've learned that ideal gases have the same average kinetic energy, but this doesn't necessarily mean that they have the same speeds within a container
Right.
Lori said:
Instead, is it right to say that (according to kinetic molecular theory) that the speed of molecules at an instance is a wide range of speeds?
While that is correct, it is not an answer to the question about the average speed.

For a fixed kinetic energy, how can you find the corresponding particle speed? Does this depend on the type of gas?
 
mfb said:
I moved the thread to our homework section.Right.While that is correct, it is not an answer to the question about the average speed.

For a fixed kinetic energy, how can you find the corresponding particle speed? Does this depend on the type of gas?
i think it depends on the mass. The greater the mass , the slower the particle and vice versa. So, since kinetic energy is same in ideal gases, wouldn't the mass make no difference and so velocity is same?
 
Lori said:
The greater the mass , the slower the particle and vice versa.
Right.
Lori said:
So, since kinetic energy is same in ideal gases, wouldn't the mass make no difference and so velocity is same?
That directly contradicts what you figured out before.
 
mfb said:
Right.That directly contradicts what you figured out before.
oh i was just confused, cause i wasn't sure if ideal gasses would neglect mass. but nvmd, cause kinetic energy is the same which means that mass is involved
 

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