Which of the listed choices is excluded from being a greenhouse gas?
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Answer: B. Hydrogen
Explanation
Hydrogen gas does not significantly absorb thermal infrared radiation and is therefore not classified as a greenhouse gas. Atmospheric hydrogen molecules lack the molecular dipole moment fluctuations required to trap outgoing longwave terrestrial thermal radiation. Gases contributing to the greenhouse effect must possess specific molecular absorption bands matching Earth's infrared emission spectra. Greenhouse gases warm planetary surfaces by absorbing and re-emitting infrared radiation released upward from the ground. Major atmospheric greenhouse gases include carbon dioxide, methane, nitrous oxide, water vapor, and tropospheric ozone molecules. Diatomic homonuclear molecules like nitrogen, oxygen, and hydrogen are transparent to infrared radiation and do not trap heat.
Methane is a potent greenhouse gas that traps significant thermal infrared radiation within the Earth atmosphere system. Nitrous oxide is an active greenhouse gas released primarily through agricultural soil management and industrial chemical manufacturing. Ozone acts as a greenhouse gas in the troposphere while shielding the planet from ultraviolet rays in the stratosphere.
- Subject
- Everyday Science
- Category
- Everyday Science
- Topic
- —
- Difficulty
- medium
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