A fresh onion, when cut, releases a gas called propanethiol-S into the air. When this gas reaches your eyes, it mixes with the water in the eye to form a weak acid. This acid irritates the eye and causes the tear-producing glands to flood the eye with water in an attempt to wash away the irritant. These tears are what makes you look like you're crying.
Wednesday, October 08, 2008
Did You Know? Vegetable Trivia
A fresh onion, when cut, releases a gas called propanethiol-S into the air. When this gas reaches your eyes, it mixes with the water in the eye to form a weak acid. This acid irritates the eye and causes the tear-producing glands to flood the eye with water in an attempt to wash away the irritant. These tears are what makes you look like you're crying.
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