The principle of popcorn

Put a proper amount of corn (or rice) into the popcorn pot, seal the top cover, and then put the popcorn pot on the stove and rotate it continuously to make it evenly heated, so that delicious popcorn can be popped.

This is because in the process of heating, the temperature in the pot keeps rising, and the pressure of the gas in the pot keeps increasing. When the temperature rises to a certain extent, the rice grains will gradually become soft, and most of the water in the rice grains will become steam. Because of the high temperature, the pressure of water vapor is very high, which makes the softened rice grains expand. But at this time, the pressure inside and outside the rice grain is balanced, so the rice grain will not explode in the pot.

When the pressure in the pot rises to 4-5 atmospheres, the top cover of the popcorn pot is suddenly opened, the gas in the pot expands rapidly, and the pressure decreases rapidly, which makes the pressure difference between the inside and outside of the rice grains increase, resulting in the rapid expansion of high-pressure steam in the rice grains, which instantly explodes the rice grains and becomes popcorn.