河南农村美食--爆米花 Henan Rural Delicacy - Popcorn

取适量的玉米（或大米）放入爆米花锅内，并封好顶盖，再把爆米花锅放在火炉上不断转动使之均匀受热后，就可爆出可口的爆米花来。
这是因为在加热的过程中，锅内的温度不断升高，锅内气体的压强也不断增大。当温度升高到一定程度，米粒便会逐渐变软，米粒内的大部分水分变成水蒸气。由于温度较高，水蒸气的压强是很大的，使已变软的米粒膨胀。
但此时米粒内外的压强是平衡的，所以米粒不会在锅内爆开。当锅内压强升到4-5个大气压时，突然打开爆米花锅的顶盖，锅内的气体迅速膨胀，压强很快减小，使得米粒内外压强差变大，导致米粒内高压水蒸气也急剧膨胀，瞬时爆开米粒，即成了爆米花。
Take an appropriate amount of corn (or rice) and put it 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, and then delicious popcorn can be popped.
This is because during the heating process, the temperature in the pot continues to rise, and the pressure of the gas in the pot continues to increase. When the temperature rises to a certain level, the rice grains will gradually soften, and most of the water in the rice grains will turn into water vapor. Due to the high temperature, the pressure of water vapor is very large, causing the softened rice grains to expand.
But at this time, the pressure inside and outside the rice grains is balanced, so the rice grains will not explode in the pot. When the pressure in the pot rises to 4-5 atmospheres, suddenly open the top cover of the popcorn pot, the gas in the pot expands rapidly, and the pressure decreases quickly, making the pressure difference inside and outside the rice grains larger, causing the high-pressure water vapor in the rice grains to expand rapidly, and the rice grains pop instantly, that is, popcorn.