se dilater

En atteignant les régions de pression plus basse, il se refroidit en se dilatant.
As it rises to regions of lower pressure, it cools by expanding.
Les précipitations se forment lorsque la vapeur d’eau se condense, généralement dans de l’air ascendant qui se refroidit en se dilatant.
Precipitation forms as water vapour condenses, usually in rising air that expands and hence cools.
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