Do ideal gases move at the same speed?

Click For Summary

Homework Help Overview

The discussion revolves around the behavior of ideal gases, specifically focusing on the relationship between average kinetic energy and molecular speeds within a container. Participants explore concepts from kinetic molecular theory and question how these relate to the speeds of gas particles.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants discuss the idea that ideal gases have the same average kinetic energy but question whether this implies that they have the same speeds. There is an exploration of how particle speed relates to mass and kinetic energy, with some participants suggesting that mass may influence speed.

Discussion Status

The discussion is ongoing, with participants raising questions about the relationship between mass, kinetic energy, and particle speed. Some guidance has been offered regarding the implications of kinetic energy on speed, but there is no explicit consensus on the interpretations being explored.

Contextual Notes

Participants are navigating the complexities of kinetic molecular theory and its implications for ideal gases, including the role of mass in determining particle speed. There is a recognition of confusion regarding how mass interacts with kinetic energy in this context.

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?
 
Physics news on Phys.org
upload_2017-12-13_22-53-59.png
 

Attachments

  • upload_2017-12-13_22-53-59.png
    upload_2017-12-13_22-53-59.png
    15.4 KB · Views: 521
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
 

Similar threads

Replies
4
Views
2K
  • · Replies 8 ·
Replies
8
Views
2K
Replies
8
Views
6K
Replies
2
Views
5K
  • · Replies 6 ·
Replies
6
Views
3K
  • · Replies 8 ·
Replies
8
Views
2K
Replies
24
Views
3K
  • · Replies 32 ·
2
Replies
32
Views
3K
Replies
1
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K