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Because the gas evolved from the cutted onions, named syn-propanethial-S-oxide, is irritating for the eyes.

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15y ago
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5mo ago

When onions are cut, they release a compound called syn-propanethial-S-oxide. This compound triggers a reaction in our eyes, causing tear glands to produce tears as a defense mechanism to flush out irritants. The tears help to protect the eye from the irritating fumes released by the onion.

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Q: Why man gets tears while cutting onions?
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