CHEM 3615H CHAP 20

Different average speeds can be calculated from the

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: L. Boltzmann leads to the prediction that different gas molecules have different speeds (due to collisions) and that the equilibrium state of a gas exhibits an equilibrium distribution of speeds (known as the Maxwell- Boltzmann distribution). Different average speeds can be calculated from the distribution (most- probable speed (cmp), mean or average speed (<c>) and root- mean- square speed (crms)). cmp = (2RT/M)1/2 <c> = (8RT/pM)1/2 <c2>1/2 = crms = (3RT/M)1/2 All show the same qualitative dependence on temperature and molar mass (c ~ (T/M)1/2) and these averages have a very similar magnitude. In problems dealing with kinetic energy, we will be using the root mean square speed, while in problems dealing with mean- free path, collision flux, rate of effusion, viscosity, heat transfer coefficient, gas diffusion, etc… we will be using the mean or av...
View Full Document

This note was uploaded on 01/26/2014 for the course CHEM 3615 taught by Professor Aresker during the Spring '07 term at Virginia Tech.

Ask a homework question - tutors are online