When you cut an onion some chemicals get released which are ‘lachrymators’. This just means a chemical which reacts with the glands in your eyes that produce tears and makes you cry!
There’s a chemical that I use in my work called ‘benzyl bromide’ which does the same thing but a lot worse! Once someone throw some of it in the bin in the lab and we all had to leave because we were all crying so much!
What Harry said! It’s interesting how some onions make you cry more than others though. I once accidentally gassed my lab with benzyl bromide because my fume hood stopped working, but I was the only one it didn’t affect, weirdly! Onions make me cry loads though. I find putting a spoon in my mouth helps. Some people think this is because the lachrymators bind to the metal of the spoon, others think it’s a placebo that just distracts you, but there doesn’t seem to be any conclusive evidence
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