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বায়ুমণ্ডলে অক্সিজেনের পরিমাণ – প্রায় ২০.৬% (আয়তন হিসেবে) বা প্রায় ২৩.১% (ওজন হিসেবে)।
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বায়ুমণ্ডলে অক্সিজেনের পরিমাণ – প্রায় ২০.৬% (আয়তন হিসেবে) বা প্রায় ২৩.১% (ওজন হিসেবে)।