Why do onions make you cry?

Why cooked onions do not make you cry?

  • Fresh onions make you cry but why don't cooked onions? Is a certain chemical evaporated or something?

  • Answer:

    When you cut an onion, propanethiol S-oxide, a volatile sulfur compound is released; this is what irritates your eyes and causes tearing. Since this compound is volatile, it quickly evaporates when heated, so cooked onions no longer have any of it to release.

Emily at Yahoo! Answers Visit the source

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