Passing Gases: Effusion, Diffusion, and the Velocity of a Gas

Passing Gases: Effusion, Diffusion, and the Velocity of a Gas - Crash Course Chemistry #16

2013-06-03

[public] 542K views, 7.42K likes, 85.0 dislikes audio only

We have learned over the past few weeks that gases have real-life constraints on how they move here in the non-ideal world. As with most things in chemistry (and also in life), how a gas moves is more complex than it seems at first. In this episode, Hank describes what it means when we talk about the velocity of a gas - to understand gas velocity, we have to know what factors affect it, and how. Hank also teaches you about effusion, diffusion, and concentration gradients, before showing off a cool experiment that physically demonstrates the things you have just learned. Sound exciting enough for you? Let's get started.

*Special Thanks to Matt Young at the University of Montana (Geosciences Department, Environmental Biogeochemistry Lab) who helped with the chemical demonstrations.*

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Table of Contents

Net Velocity vs. Average Velocity 1:17

Effusion 4:47

Graham's Law 5:52

Diffusion 7:22

Concentration Gradients 7:08

Precipitation Reaction with Gases 8:21

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