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What causes the smell after rain? | HowStuffWorks
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Still Listening. I Got You. When it comes in contact with organic debris or chemicals on the ground, it can cause some particularly aromatic reactions.
It breaks apart soil and releases minerals trapped inside, and it reacts with chemicals, such as gasoline, giving them a stronger smell. These reactions generally produce more unpleasant smells than bacteria spores, which is why the after-the-rain smell isn't always a good one.ragejohnson.com/wp-content/47.php
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Like the smell caused by the bacteria spores, the smell of chemical reactions is most noticeable when it rains following a dry spell. This is because once the chemicals on the ground have been diluted by one downpour, they don't have the same reaction with the rainwater. Another after-the-rain smell comes from volatile oils that plants and trees release.
The oil then collects on surfaces such as rocks. The rain reacts with the oil on the rocks and carries it as a gas through the air.
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This scent is like the bacteria spores in that most people consider it a pleasant, fresh smell. It has even been bottled and sold for its aromatic qualities! These are a few common rain smells, but there are also all sorts of other scents after it rains. There is lots of aromatic material that the moisture and impact of rain can stir up, and the moist atmosphere following a downpour is particularly good at carrying these particles through the air.
So, when you talk about the after-the-rain smell with a friend, you may mean one thing while your friend is thinking of something else. You'll both agree, however, that the air has a much stronger aroma to it after a good rain. Print "What causes the smell after rain? How Acid Rain Works.
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