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

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 at first appears. 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 effect 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.*

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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