Oxygen makes up 21% of the air, meaning that out of every 100 parts, 21 parts are oxygen. Chapter 11 Nature’s Treasures NCERT Science Textbook Curiosity Science Session 2024-2025.
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Oxygen makes up 21% of the air, meaning that out of every 100 parts, 21 parts are oxygen. Chapter 11 Nature’s Treasures NCERT Science Textbook Curiosity Science Session 2024-2025.