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  • Smart Learning for All

  • Topic: Heat.

  • Why do woolen clothes keep us warm?

  • The night is quite cold and you have worn cotton clothes.

  • Why don't you wear some woolen clothes?

  • They will keep you warm.

  • Please listen to me.

  • Look.

  • You are shivering.

  • At least now wear some woolen clothes.

  • Now you are feeling warm, right?

  • Do you know why?

  • Wait, I will tell you.

  • Both wool and cotton are bad conductors of heat.

  • They do not conduct or transmit heat to the surrounding.

  • Then why do we feel warm only in woolen clothes?

  • This is because, in woolen clothes.

  • There are many more tiny spaces as compared to that in cotton clothes.

  • Due to these extra tiny spaces, woolen clothes trap more air as compared to cotton clothes.

  • Now, since air is a bad conductor of heat.

  • Woolen clothes containing more air, do not allow much of our body heat to escape into the atmosphere.

  • Thus keeping us warm.

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B1 中級 美國腔

為什麼羊毛衫能保暖?| 羊毛衫 (Why do woolen clothes keep us warm? | #aumsum)

  • 20 1
    AumSum 發佈於 2021 年 01 月 14 日
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