The principle of popcorn take the right amount of corn (or rice) into the popcorn pot, and seal the top cover, and then put the popcorn pot on the stove and constantly rotating so that it is evenly heated, you can pop delicious popcorn to. This is because in the heating process, the temperature inside the pot continues to rise, the pressure of the gas inside the pot is also increasing. When the temperature rises to a certain extent, the rice will gradually become soft, most of the water within the rice into water vapor. Because of the higher temperature, the pressure of water vapor is very large, so that the softened rice grain expansion. But at this time the pressure inside and outside the rice is balanced, so the rice will not burst in the pot. When the pressure inside the pot rose to 4-5 atmospheric pressure, suddenly open the top cover of the popcorn pot, the rapid expansion of the gas inside the pot, the pressure is quickly reduced, making the rice grains inside and outside the pressure difference becomes large, resulting in high-pressure water vapor inside the rice grains also expanded dramatically, instantaneous bursting of the rice grains, that is, into the popcorn.
Available pot or microwave can also make popcorn.