when you boil liquids in your microwave. It may not be necessary, but it won’t hurt anything either.
The explanation for the explosion is described in the UNWISE MICROWAVE OVEN EXPERIMENTS website as following:
Things are different in a microwave oven. The water gets hot but the
container usually does not. There are no “boiling-bubbles” triggered by a
hot metal pot. Without those bubbles to cool it, the temperature of the
water rises far higher than 100C°. We call this “superheated water.”
Superheated water is just waiting for some sort of trigger which will
let bubbles form and allow boiling to commence. If the water becomes hot
enough, a few bubbles will appear, but these quickly rise and burst,
and the water isn’t cooled much at all. In the microwave oven, even if
your mug of water is bubbling slightly, don’t trust it, since it’s
temperature has risen so high above 100C° that bubbles are appearing
spontaneously. If some unwitting victim should pour a soluble powder
into the superheated water, this will carry thousands of tiny air
bubbles into the water. Each of these micro bubbles expands into a 1cm
steam bubble, and the result is a huge “explosion” of hot froth. It’s
just like dumping ice cream into root beer, but the froth can be so
violent that the hot water sprays into the air.
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