“Known as “petrichor”, this odor has been studied by scientists and even by perfume manufacturers.
The chemical substance in question is “geosmin”, this molecule is present in most healthy soils
When water droplets fall on the ground, they cause the geosmin to be launched into the air, making it more abundant than it was before the rain.
There is research that suggests that geosmin may be related to the “terpene” – source of the perfume of several plants. And the rain can accentuate these fragrances.
It is not just the relief, after a long period of drought, that makes the “smell of the rain” so pleasant. According to scientists there are a number of factors involved that mainly involve chemistry.”
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