The British spelling of the process of removing volatile (easily evaporating) substances from a material, such as removing gases from rocks or soil.
From de- + volatile + -isation (British suffix), volatile comes from Latin volatilis (flying, fleeting). This is a technical chemistry/geology term.
Geologists use devolatilisation to understand how planets form—by heating ancient rocks and measuring what gases escape, they can recreate conditions from billions of years ago!
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