Principle:

Take the right amount of sweet corn into the popcorn pot, and seal the top cover, and then put the popcorn pot on the stove and constantly rotate to make it evenly heated, you can pop delicious popcorn. 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 corn kernels will gradually become soft, most of the water within the corn kernels into water vapor. Due to the higher temperature, the pressure of the water vapor is very strong, so that the softened kernel of rice 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 difference between the pressure inside and outside the rice grains, resulting in high pressure within the rice grains of water vapor is also rapidly expanding, instantaneous bursting of the rice grains, that is, it has become the popcorn.