Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Why do onions make you cry?

  1. Apr 5, 2005 #1


    User Avatar

    What is the chemical/s in onions that make your eyes tear? And biologically, why do they tear?
  2. jcsd
  3. Apr 5, 2005 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

  4. Apr 5, 2005 #3
    From that web-site:

    "There are all kinds of remedies for dealing with this irritating phenomenon, some more effective than others. As a general rule, move your head as far away from the onion as you can, so the gas will mostly disperse before it reaches your eyes. If you really can't stand the tears, the simplest solution might be to wear goggles...."

    Actually, there's a method I've tried that works very well: breathe in the smell deeply! It causes your eyes to water a lot right away, but after a few seconds, you're no longer bothered.
  5. Apr 6, 2005 #4


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    Just keep the onion intact while you're cutting it :rolleyes:
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Why do onions make you cry?