大氣層中氧氣占百分幾???
回答 (7)
2006-12-03 7:09 pm
✔ 最佳答案
係一樣嫁合成物 佔有量(體積比) 功用
氮氣 78.084% 維持植物生長
氧氣 21.946% 維持生命和幫助燃燒
二氧化碳 0.037% 保持地面溫暖
臭氧 0.000004% 抵擋有害的紫外線輻射
其它氣體 ?
水蒸氣 無常 影響天氣狀況
固體粒子，包括灰塵、火山灰等等 ? 對雲和雲霧的形成非常重要
參考: wikipedia
2006-12-05 2:41 am
都係一樣ga...只不過空氣係大氣層愈高就愈稀薄
2006-12-04 3:11 am
Oxygen is usually 21% in all layers of the atmosphere.
When we go to high mountains, we have difficulties in breathing. It is not because of the low percentage of oxygen, but is due to the low pressure of air.
Therefore, when the diaphragm flattens to lower the air pressure in rib cage, the air pressure outside is to low that air can't get into the lungs easily.
When we go to high mountains, we have difficulties in breathing. It is not because of the low percentage of oxygen, but is due to the low pressure of air.
Therefore, when the diaphragm flattens to lower the air pressure in rib cage, the air pressure outside is to low that air can't get into the lungs easily.
參考: Chem and Bio textbooks
2006-12-03 8:01 pm
五分之一.
2006-12-03 7:11 pm
大氣的主要成分
氮氣~78.084%
氧氣~21.946%
二氧化碳~0.037%
臭氧~0.000004%
氮氣~78.084%
氧氣~21.946%
二氧化碳~0.037%
臭氧~0.000004%
2006-12-03 7:11 pm
大約佔五分之一。
收錄日期: 2021-04-13 17:21:55
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061203000051KK01212