alleryশুষ্ক বায়ুতে অক্সিজেনের আনুমানিক শতকরা পরিমাণ কত?
A12 শতাংশ
B15 শতাংশ
C18 শতাংশ
D21 শতাংশ
Answer & Solution
Correct answer: D. 21 শতাংশ
পৃথিবীর বায়ুমণ্ডলের শুষ্ক বায়ুর আয়তনের প্রায় 20.95 percent হল অক্সিজেন।
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