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বায়ুমণ্ডলে অক্সিজেনের পরিমাণ 20.6% (আয়তন হিসেবে)।
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বায়ুমণ্ডলে অক্সিজেনের পরিমাণ 20.6% (আয়তন হিসেবে)।