Approximately 20% of the atmosphere is made of which element?

Approximately 20% of the atmosphere is made of which element?

Correct Answer: nitrogen
hydrogen
carbon
oxygen

Explanation: Approximately 20% of the atmosphere is oxygen. This gas is essential for life. In environments where oxygen is in low supply, it can be provided from a tank. Since gases are very compressible, a large amount of oxygen can be stored in a relatively small container. When it is released, the volume expands and the pressure decreases. The gas is then available for breathing under normal pressure.

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