Question

why do onions make us cry??

Answer 1

Heya friend.
Here's your answer.
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When onions are cut ,the walls of the onion's cells break which releases the acid inside the cytoplasm in the air. This acid causes the irritating sensation in the eyes.
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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. ... The synthase enzyme converts the amino acids sulfoxides of the onion into sulfenic acid. The unstable sulfenic acid rearranges itself into syn-ropanethial-S-oxide