Past tense of adsorb; a substance has attached itself to a surface through physical attraction.
From 'ad-' + 'sorb' (from Latin sorbere). The past tense form became standardized in chemistry literature by the mid-20th century.
Gases getting adsorbed onto a solid surface happens so fast you can't see it, yet it's powerful enough to clean toxic fumes from industrial smokestacks—invisible chemistry saving lives.
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