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3Fe1 Air – Electric Fan

$50.00 $38.00

What is air made up of?

When the earth was formed at the very beginning, the earth surface and earth crust had 90% nitrogen with no oxygen and carbon dioxide.  Carbon dioxide and oxygen were gradually released from volcanic eruptions but oxygen was still rare at that time.  Oxygen released from photosynthesis increased after the existence of plants.  This made up the atmosphere of all living things now.

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Description

空氣是指地球大氣層中的氣體混合。它主要由78%的氮氣、21%氧氣、還有1%的稀有氣體和雜質組成的混合物。空氣的成分不是固定的,隨著高度的改變、氣壓的改變,空氣的組成比例也會改變。

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