When we cut an onion, we cry and say that it is an onion. Which two physical phenomena are also to blame for our tears?

When we are onion regime, we destroy its juice-filled cells. The liquid juice begins to evaporate. Evaporation is the first physical phenomenon observed in this process. As a result of the chaotic movement of the molecules of the vapors of juice and air, their mutual penetration occurs, and the pungent smell of onions spreads through the air. This phenomenon is called diffusion – the second physical phenomenon observed in this process. Once it reaches our eyes, the onion juice causes irritation and watery eyes.
Answer: Evaporation and diffusion are two physical phenomena that are to blame for our tears when cutting onions.