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江津富氧空氣檢測

信息編號:63894339 發(fā)布時間:2025/7/30 11:11:47
重慶科洋檢驗有限公司是一家依法成立并能夠承擔相應法律責任的第三方檢測中心。支持全國上門取貨、寄樣檢測,檢測周期短費用低,歡迎來電咨詢!在干燥空氣中,氧氣含量約為20.95%。當空氣潮濕時,這個數(shù)字會減少,因為空氣中水蒸氣多了。地球上的氧氣含量是不斷變化的。在地球誕生的前20億年,空氣中沒有氧氣。直到大約24億年前,大氣中的氧氣含量才開始緩慢上升。大約在5.4億年前,大氣中的氧氣含量已經(jīng)達到15% 35%。大量的氧氣使多細胞生物。氧濃度高的時期是石炭紀(3.55億年至2.95億年前)。當時地球上出現(xiàn)了許多巨大的昆蟲,比如翼展70cm的蜻蜓。
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