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

We know that gases move throughout and out of our bodies, but why? And how? Learn about gas movement by analyzing rates of effusion. Additionally, watch an interesting precipitate reaction using gases to apply effusion, diffusion, and formation of solids from two gases.

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CCSS: Adaptable
NGSS: Adaptable
Additional Tags
Instructional Ideas
  • Stop the video throughout and have pairs of learners discuss prescripted questions about diffusion, effusion, temperature, and kinetic energy
  • Work effusion problems after video to further enforce concepts
Classroom Considerations
  • Classroom must have a computer, Internet access, and a projection system 
  • Video assumes learners have a basic understanding of precipitate reactions
  • Pupils should have a good understanding of mathematics — division of square roots, inverse proportions, and significant figures
  • Great demonstration (at 8:22) that brings together diffusion, effusion, and precipitate reactions using gases
  • The video shows the mathematics of equations, and it walks through each step (albeit quickly)
  • Video does not give an applicable example of effusion and how it relates to the real world
Common Core