Question

why we don't cry when we cut other vegetables except onions

Answer 1

Hi user! :)) ❤
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• Our eyes get teary because of the acid which is formed by sulphur in the air from onion.

• This sulphur gas is formed by another gas which is released in air by onion while cutting and it is called:
$Propanethiol S-oxide$

• It combines with the enzymes present in our eyes ( cornea) resulting in formation acid which irritates our eyes.

• this is not found in any other vegetable so our eyes don't get teary.
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Hope it helps...!! ❤

Answer 2

It’s a well-known fact that onions make you cry. We’ve all experienced this while cooking; we start chopping an onion, our eyes start stinging and the next thing we know we have tears rolling down our cheeks.

Blinking or rubbing our eyes only makes it worse. It’s happened to us all, but have you ever wondered why?

When you slice into an onion you’re breaking apart the cells inside. These release their contents which form sulfenic acids. These acids mix with enzymes to produce a gas called propanethiol S-oxide. As this gas reaches our eyes and mixes with the water in them, it forms sulfuric acid.

This acid makes our eyes sting, which results in more tears and this added water produces more acid, which in turn produces more irritation. Cooking the onion then deactivates the enzyme and our eyes return back to normal