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Carbon dioxide is heavier than oxygen an...

Carbon dioxide is heavier than oxygen and nitrogen but it does not form the lower layer of the atmosphere. Explain.

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Gases have the property of diffusion which is independent of the force of gravitation. Due to diffusion, the gases mix into each other and remain almost uniformaly distrubuted in the atmosphere.
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Carbon dioxide is heavier than oxygen and nitrogen but it does not form the lower layer of the atmosophere. Exoplain.

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Statement I: The earth does not retain hydrogen molecules and helium atoms in its atmosphere, but does retain much heavier molecules, such as oxygen and nitrogen. Statement II: Lighter molecules in the atmosphere have translational speed that is greater or closer to escape speed of earth.

How does oxygen and carbon dioxide remain nearly constant in the atmosphere?

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MODERN PUBLICATION-STATES OF MATTER : GASES AND LIQUIDS-HIGHER ORDER THINKING SKILLS (ADVANCED LEVEL)
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