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  • Smart Learning for All

  • Topic: Rain.

  • Why does rain smell?

  • Maybe it applies a special perfume.

  • No.

  • Rain is just water and water doesn't have any smell.

  • So, what's that smell?

  • The distinctive smell which frequently accompanies the first rain after a dry weather.

  • Is scientifically called petrichor.

  • It basically comes from plants and bacteria called actinomycetes which live in the soil.

  • Now during a long dry spell, the plants release oils into the soil to block other seeds from germinating.

  • Thus reducing competition for water.

  • Whereas, the actinomycetes produce a chemical called geosmin.

  • Now when rain hits the ground, it brings up the oils and geosmin which then mix with air.

  • The combination of this geosmin along with the plant oils form the smell which we receive after the rain.

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為什麼雨會有味道?| 為什麼雨會有味道? (Why does rain smell? | #aumsum)

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    AumSum 發佈於 2021 年 01 月 14 日
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