445lec19 - PHYS 445 Lecture 19 - MB continued Lecture 19 -...

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PHYS 445 Lecture 19 - MB continued 19 - 1 © 2001 by David Boal, Simon Fraser University. All rights reserved; further resale or copying is strictly prohibited. Lecture 19 - MB continued What's Important: pressure of an ideal gas Text : Reif Pressure of an ideal gas Our picture of an ideal gas hitting a wall is With each collision, an amount of momentum 2 mv z is transferred to the wall, giving rise to a pressure, or force per unit area. If the collisions occur over a time interval t , then for a given value of v z [ momentum change ] = 2 mv z • [ collisions per unit time ] • t But the force from the collisions is equal to p / t , so for a given value of v z [ force per unit area ] = 2 mv z • [ collisions per unit time per unit area ] • t / t . That is, the pressure from v z is [ pressure ] = 2 mv z • [ collisions per unit time per unit area ]. Now, the [ collisions per unit time per unit area ] is also called the flux. If the particles all moved perpendicular to the wall, then the flux would be
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This note was uploaded on 09/07/2009 for the course PHYS 445 taught by Professor Davidboal during the Spring '08 term at Simon Fraser.

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445lec19 - PHYS 445 Lecture 19 - MB continued Lecture 19 -...

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