Does Diffusion Happen Quicker in a Semi-Solid Than in Air?

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Diffusion does not happen quicker in a semi-solid than in air. Find out why diffusion doesn't happen quicker in a semi-solid than in air with help from an experienced chemistry professional in this free video clip.

Part of the Video Series: Chemistry & Biology Concepts
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Hi, I'm Robin Higgins, and this is does diffusion happen quicker in a semi-solid than in air. Okay, so the answer is no. Let's go over diffusion with two different examples. So, on one case let's just say that we have a nice box and it's full of air. In the other case let's say that we have a nice little fruit cake made of jello. Okay, so on one case we have air, and let's say that we have a little port, and we let oxygen gas in. Now at first, the oxygen gas is just gonna be here, but we know that over time it will spread out completely. So this is diffusion. And now we're asking does this process happen faster or slower than trying to diffuse something through a semi-solid like jello. Well, imagine if we added right here a little chunk of fruit, maybe a cherry, and then we waited to see if it would diffuse. Well, if we waited a long time, it might kind of sink down to the bottom, and it might diffuse a little bit, but it wouldn't go all over the place, and if we did something smaller like a particle like sugar, a semi-solid will still diffuse, but it's gonna be in a very slow pace, so you can think about this just in any everyday life example that you've experienced. Gas on the other hand diffuses extremely quickly. Oftentimes it's too quick to even really measure, it's just very fast. And that's because particles in a gas are always moving faster than the particles in a solid. The solid is trapped together bonded to each other, and the gas is free floating, it can go wherever it wants to. So, if you were trying to diffuse a gas and a semi-solid, the gas would diffuse more quickly. I'm Robin Higgins, and this is does diffusion happen more quickly in a semi-solid than in air.

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