Question

when we cut Onions why we get tears?

Answer 1

When we cut onion, it releases a gas called, Propanethiol S-oxide. When mixed with certain enzymes in the onion, it creates a sulphur gas. These gases then get into our eyes and create a mild acid which irritates the eyes and bring Out tears.
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Answer 2

Onions produce the chemical irritant known as syn-propanethial-S-oxide. It stimulates the eyes' lachrymal glands so they release tears. Scientists used to blame the enzyme allinase for the instability of substances in a cut onion.