Why does chopping an onion make you cry
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a chemical irritant known as syn-propanenthiol-s-oxide that reacts with other enzyms in the onion to produce sulphur gas make us cry
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When you cut an onion, you break cells, releasing their contents. Amino acid sulfoxides form sulfenic acids. Enzymes that were kept separate now are free to mix with the sulfenic acids to produce propanethiol S-oxide, a volatile sulfur compound that wafts upward toward your eyes. This gas reacts with the water in your tears to form sulfuric acid. The sulfuric acid burns, stimulating your eyes to release more tears to wash the irritant away.
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