inversion
in-VUR-zhuhn
/ɪnˈvɜːrʒən/
A meteorological condition in which atmospheric temperature increases with altitude, reversing the normal warm-below, cold-above arrangement and trapping air.
Acts like a lid over valley cities, preventing ground pollutants from rising and dispersing.
The story behind the word. From Latin 'inversio' (a turning upside down), derived from 'invertere' (to turn about). Meteorologists in the late 19th century picked up the word to describe upside-down atmospheric temperature layers.
Word relationships
- reversal: 'Reversal' is a general term for turning around; 'inversion' is the precise scientific term for upside-down temperature stratification.
- lapse rate: Lapse rate describes normal cooling with altitude, the opposite of an atmospheric inversion.
Commonly confused with
- conversion: Conversion means changing from one state to another; inversion means turning upside-down.
Word family
- invert (verb): To turn upside down or reverse in position.
- inverted (adjective): Turned upside down or upside down in order.
Collocations
- thermal inversion
- temperature inversion
- inversion layer
- trapped by an inversion
Example sentences
- "A persistent thermal inversion over the valley trapped exhaust fumes near ground level for five consecutive days." Meteorological Studies
- "City officials issued air quality warnings because a winter thermal inversion prevented pollution from lifting." Urban Planning
Memory hook
INVERSION = INVERTED temperature (warm air on top of cold air). Inversion = Upside-down temperature layer trapping smog.
When not to use
Do not use as a synonym for simple calm weather; it refers specifically to inverted vertical temperature profiles.
Fun facts
- Inversions in mountainous basins like Salt Lake City or Mexico City can trap pollution for weeks during winter high-pressure weather systems.
Related words
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