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Because the popcorn starts out as seeds. When the seeds start to pop, the bag has to get bigger to hold all of the popcorn.

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Q: Why does the microwave popcorn bag expand when the popcorn pops?
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Related questions

Which bag brand of popcorn pops the fastest conclusions?

The fastest conclusions cannot be popped by a bag of popcorn.


Why did the microwave popcorn bag set on fire when you had kept it in the microwave just for 2min?

The heat generated inside the bag exceeded the insulation resistance of the bag content.


Does popcorn grow from a seed?

yes because if you buy a popcorn bag their will be seeds so if you put it in the microwave they will turn into ready popcorn


Why are microwave bag so large with only a small space taken up by corn kernels?

When the popcorn kernels pop they expand 10 times their original size therefore taking up more room in the bag.


How long can you put popcorn in a microwave and not let it get hot but let it all pop?

You can't. They purposely add kernals to the bag that won't pop. So you will never have a bag that fully completely pops. Watched it on foodnetwork...unfortunately, that's life:(


Can popcorn be popped in any paper bag?

No, because any paper bag can't go in the microwave.


How long do you have to put a small bag of popcorn in the microwave?

That will vary depending on the wattage of the machine and the size of the bag.


How do you pop popcorn on the cob?

Place popcorn on the cob in a brown paper bag and close bag tightly. Place in microwave and cook on high for about two minutes.


How do you microwave popcorn?

I understand that there are special sealed containers of popcorn suitable to cook in a microwave. Apparently, there are instructions on the label. The reason why special sealed containers are used is to prevent the popcorn shooting all over the inside of the microwave. One website stated that it was possible to microwave popcorn placed inside a brown paper bag!


Which brand of popcorn had the fewest unpopped kenels?

It depends on how long you pop the bag in the microwave.


How many unpoped kernels are in a bag of popcorn?

It depends on the popcorn, and for how long you put it in the microwave.


Why does steam come out of a fresh bag of popcorn?

Popcorn pops because of the water content in the kernels. Heating the kernels, whether by microwave or by some other means, turns the water into steam, which expands and breaks the kernels. Admittedly, this is a small amount of water, but it doesn't take much steam, to pop a kernel.