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| Why do certain gases interact |
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| with radiation? |
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| When
radiation impinges on a |
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| molecule, it
can excite the molecule, |
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| either by
vibrating or rotating it. |
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| Molecules of
a particular kind of gas |
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| have a
different shape from |
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| molecules of
another type of gas, |
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| and so are
excited by radiation in |
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| different ways. |
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| CH4 |
| H2O |
| CO2 |