Relating to or consisting of separate particles, or as a noun, fine solid particles suspended in air or liquid. Often used in environmental science to describe air pollution.
From Latin 'particula' (small part), diminutive of 'pars' (part), with the suffix '-ate' indicating possession of a quality. The modern environmental usage emerged in the mid-20th century as air quality became a scientific concern.
Particulate matter reveals the invisible world around us - those tiny PM2.5 particles (smaller than 2.5 micrometers) that concern environmentalists are so small that 30 of them could fit across the width of a human hair. The word's journey from 'part' to 'particle' to 'particulate' shows how language adapts to express increasingly precise scientific concepts.
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