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| an area within which the air frequently is confined or channeled, with all parts of the area thus being subject to similar conditions of air pollution |
| a fog that does not moisten exposed surfaces |
| Main Entry: | condensation nucleus |
| Part of Speech: | n |
| Definition: | any tiny suspended particle in the atmosphere, either liquid or solid, upon which condensation of water vapor begins |
| Example: | Most condensation nuclei are produced by natural and man-made fires over land and by wave action over the oceans. |
| Usage: | science |