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.
What percentage of air is made up of oxygen?
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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.
Oxygen makes up about 21% of Earth’s atmosphere. This percentage is essential for supporting life, as it is the primary gas used in respiration by humans, animals, and many other living organisms.
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