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  • Smart Learning for All

  • Topic: Diffusion.

  • Why can we smell hot food from a distance?

  • Hey.

  • Looks like you have lost your way.

  • No.

  • I know the way.

  • Fine.

  • Don't listen.

  • See, I told you.

  • Now listen to me.

  • There is a restaurant next to your house where hot sizzling food is available, right?

  • Yeah.

  • Yummy.

  • Follow its smell and you will reach home.

  • I have reached home.

  • Do you know how the smell of that food reached you?

  • When food gets cooked, it releases some aromatic gases into the air.

  • The molecules of these gases spread and mix with air molecules.

  • When this air reaches our nose, we get the smell of food.

  • This process of spreading and mixing of a substance with another substance is called diffusion.

  • But then, why couldn't I smell the food inside my house from a distance?

  • This is because that food had become cold.

  • On heating food, the molecules of its aromatic gases gain kinetic energy and start vibrating faster.

  • They spread and mix easily into air, leading to an increased rate of diffusion.

  • As the food gets cold, the temperature of the aromatic gases decreases.

  • The kinetic energy of molecules decreases and they do not vibrate as much anymore.

  • Thus, the rate of diffusion decreases and we cannot smell the food from a distance.

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B2 中高級 美國腔

擴散 - 為什麼我們可以從遠處聞到熱的食物?| 擴散 - 為什麼我們能從遠處聞到熱的食物? (Diffusion - Why can we smell hot food from a distance? | #aumsum)

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    AumSum 發佈於 2021 年 01 月 14 日
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