Let's look at the normal boiling.
When we heat water on a pot, the heat is applied from bottom, creating a circulation of water and helping bubbles to form and rise.
This is called CONVECTION......
But in microwave, water is heated more uniformly throughout. So it can actually get to a temperature above boiling without forming bubbles !!!!
This is called SUPER HEATING.
Thats why bubbles don't get formed when heating water on microwave !!!
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