Why do certain foods such as soup and sausages “blow up” in the microwave?
In: Chemistry
Pressure, essentially. Microwaves cause water molecules to vibrate, which displaces air bubbles. Heat also causes air to expand and rise to the surface. So the tiny bubble that was at the bottom, gets bigger as it heats up and moves towards the surface. Then, the surface tension of the soup in this case, breaks and flies everywhere. With sausages it’s pretty much the same thing except the air has a harder time escaping out of the casing so the usually just explode.
Edit: The vibration causes the water molecules to heat up
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