how much water is in 15 popcorn kernals?

Question

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Answer 1

Good popcorn is about 14% water. In the experiment at the Carnival of Chemistry, you can learn how much water there is in the popcorn kernels.

First you weigh some kernels of popcorn. Then you pop them (in the microwave or in hot air) and weigh them again. Do they weigh less or more?

If weight is lost where does it go? It is water that is turned to steam.

Answer 2

Popcorn "pops" by the pressure of steam building up inside the enclosed
kernel. The steam forms by heating the small amount of water remaining in
the kernel.

The amount of water in the kernel is important for good "popping". If
there is too much water, the kernel is too soft and gives way slowly
instead of exploding. If there is too little water, the steam pressure may
not be great enough to cause the explosion.

The reason that popping loose kernels of popcorn in the microwave is
difficult is that the absorption of microwave energy is only due to the
residual moisture in the corn. Commercial popcorn bags have metallized
film to capture a much larger amount of energy, and oil to conduct it to
the popcorn. Higher energy per unit time means a higher temperature and a
much higher steam pressure.

Without the rapid rise in temperature coming from the metallized film, the
kernels may give way slowly instead of exploding.