Why onions make you cry

Question:Why Do Onions Make You Cry?Answer:Unless you've avoided cooking, you've probably cut up an onion and experienced the burning and tearing you get from the vapors. 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 formsulfuric acid. The sulfuric acid burns, stimulating your eyes to release more tears to wash the irritant away.Continue Reading BelowCooking the onion inactivates the enzyme, so while the smell of cooked onions may be strong, it doesn't burn your eyes. Asidefrom wearing safetygoggles or running a fan, you can keep from crying by refrigerating your onion before cutting it (slows reactions and changes the chemistry inside the onion) or by cutting the onion under water.The sulfur-containing compounds also leave a characteristic odor on your fingers. You may be able to remove or reduce some of the smell by wiping your fingers on astainless steel odor eater.