Exploding water? In a nutshell, yes, water can “explode” in the fashion described above. However, it takes near perfect conditions to bring this about, thus “exploding water” is not something the average hot beverage drinker who would otherwise now be eyeing his microwave with trepidation need fear. Odds are, you’ll go through life without ever viewing this phenomenon first-hand, and if you’re one of the rare few who does get to see it, you will likely not be harmed by the experience (that would take your standing right over the cup at the instant it happened, and the liquid’s bolting up and hitting your skin).
The Food and Drug Administration (FDA) has advised consumers:
This type of phenomenon occurs if water is heated in a clean cup. If foreign materials such as instant coffee or sugar are added before heating, the risk is greatly reduced. If superheating has occurred, a slight disturbance or movement such as picking up the cup, or pouring in a spoon full of instant coffee, may result in a violent eruption with the boiling water exploding out of the cup.
It’s possible but iirc any imperfection in the surface will prevent this.
So would always be moot with a tea bag I guess?
It seems so
I always give it a stir with a long spoon before and after putting it in the microwave, when it won’t be in contact with my skin.