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Petrichor is the pleasant, earthy scent of rain on dry soil, a blend of plant oils, ozone, and geosmin, a compound from soil bacteria (Actinomycetes) released as aerosols when raindrops hit the ground, creating a refreshing, natural perfume especially noticeable after dry spells. The word comes from Greek petra (stone) and ichor (blood of the gods), coined by scientists studying this unique aroma. 

Key components of the smell:

Geosmin: The primary earthy component, produced by soil bacteria and released into the air by rain. Humans are extremely sensitive to it, detecting it in tiny amounts.

Plant Oils: Oils from plants accumulate on dry surfaces and are dispersed by raindrops.

Ozone: The sharp, clean smell sometimes present during thunderstorms, formed by lightning splitting oxygen and nitrogen molecules. 

How it happens:

Raindrops hit porous surfaces, trapping air bubbles that shoot up as aerosols.

These aerosols carry the geosmin, plant oils, and other compounds into the air. #naturekey #naturesounds #science #wonderful #rainsounds #sciencefacts

The resulting mix creates the familiar, beloved scent. 

When it's strongest:

Petrichor is most intense after a light rain following a warm, dry period, as this maximizes the release of these aromatic compounds.