# Thread: Kinetic molecular theory of gases

1. Hello,world,miss you all
1-http://en.wikipedia.org/wiki/Kinetic_theory
we study this proof at school and I've never understood it,although a lot of teachers tried to help,but may be I need a little bit special way to introduce this proof into my mind.

my first question:what are the basic concepts I need to understand before understanding this proof?
second:why does the linear momentum of the wall has an opposite sign not the same sign as the linear momentum of the gas particle?

third:what is delta(t)?Is it the time between two collisions?the molecule moves a distance (L) to collide with the wall.then after collision it rebounces and moves another (L) to make a second collision with the opposite wall?that's the way I think of it so I hope I'm on the right track?

fourth:what is the difference between the average speed of the particle and the speed in one direction? that's the most confusing question to me,
a particle indeed moves with the same speed in x,y and z directions so what is the need to call speed in direction x Vx and speed in direction y Vy
and what does this silly average velocity represent?  2.

3. If a particle is moving the same speed on all three axis then it must be traveling on a 45% path relative to all axis. Its velosity would then be x times the square root of 2. Its actual path is the hypotenus of a triangle, or more precisly the diagonal from a cube defined by the values of x,y and z. I think that's right but my solid geometry skills may be a bit off.  Bookmarks
 Posting Permissions
 You may not post new threads You may not post replies You may not post attachments You may not edit your posts   BB code is On Smilies are On [IMG] code is On [VIDEO] code is On HTML code is Off Trackbacks are Off Pingbacks are Off Refbacks are On Terms of Use Agreement