Cardboard one would just blacken on the edges. Styrofoam would melt and probably catch fire.
it melts
If there was no feedback in an oven system, it would keep getting hotter until it melted, exploded, or was turned off.
If you place a potato on an piece of unprinted paper in the microwave oven, the potato would heat up, the paper would not.
Putting metal in the microwave can cause a fire to happen.
The roast I just put in the oven would be ruined in about an hour.
You will have a slightly higher utility bill
* milk carton * mixer * melon baller * microwave oven * mugs
its a loaf
1500 Watt.
not usually, but it does happen
It will melt
The balloon would expand and potentially burst if it's exposed to the rapid change in temperature from the fridge to the oven. The air molecules inside the balloon would heat up and increase in pressure, causing the balloon to inflate and possibly rupture.