Q
Why does cutting onions make you cry?
A
Expert Answer
Cutting ruptures onion cells, releasing enzymes that convert sulfur compounds into syn-propanethial-S-oxide—a volatile gas. When it contacts eye moisture, it forms sulfuric acid, triggering tears. Chilling onions, cutting under water, or using sharp knives reduces this reaction.
Key Insight
Cutting ruptures onion cells, releasing enzymes that convert sulfur compounds into syn-propanethial-S-oxide—a volatile gas.
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