Onions release a compound called … Dille, Carolyn, and Susan Belsinger. It's a defense mechanism. If it is heated, it turns to smoke like vapor. Cutting an onion releases these sulfur compounds. There are, however, other ways to avoid these tears. Sulphur is a solid, not gas. You could choose a well-ventilated area for your battle against the onion. By debilitating the basic component of the chemical reaction, you successfully eliminate all chances of suffering an unprovoked emotional trauma. People put up with the tears associated with cutting onions to take advantage of their distinctive taste and health benefits. Onions External (Texas A&M University) - Provides all types of information about onions such as planting tips, the varieties, the history and laws, and onion recipes. Sulfur is an irritant to both our noses and to our eyes. It’s a defense mechanism against critters — or humans — who want to eat them. External (PennState Extension) Further Reading. Aug. 2, 2017 — Adding onions to a recipe can make a meal taste rich and savory, but cutting up the onion can be brutal. When these sulfur compounds come in contact with the water in our eyes, they produce sulfuric acid. This defense mechanism from the onion produces a defense mechanism in its predators: tears. Onions don't contain pure sulphur for that to happen. The onion is a vegetable that people use in the kitchen as a cooking ingredient. According to the National Onion Association, the average American consumes 20 pounds of onions each year. Topics. But why do onions actually make us cry? Certainly sweeter onions tend to have less of the sulphur-containing compounds that eventually produce the propanthial s-oxide. Why do onions make you cry? Why Do Onions Make You Cry? By heating an onion, you basically inactivate the synthase enzyme. But it's also possible that no two onions from the same bag will have the same effect, so cutting into the vegetable may be the only way to know if it will make you cry. Onions release a chemical irritant called syn … Onions contain a volatile chemical called syn-Propanethial S-oxide (C3H6OS). Why do onions make us cry? The brain tells the eyes to start crying as a defense mechanism to get rid of the irritant. Why Do Onions Make You Cry? Chopping an onion causes all of the acids and enzymes in its cells to mix, producing a chemical irritant known as lachrymatory factor (or LF). When an onion is cut, it has a natural defense mechanism … Since plants can't run away when threaten, they have to create their own defense by producing sulfur. But an onion's defence mechanism … Georgia Souyave-Murphy and Ella Woods are on the case. This defense mechanism to get rid of the irritant called syn … onions a. 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