When we walked to the movie in the theater, we bought a popcorn and enjoyed the sweetness of the popcorn while feeling that the movie was a happy moment. This puffed treat is a favorite made from rice, corn, and other grains. Popcorn is also a delicacy that people use to save time, because their aroma characteristics and excellent taste promote digestion and absorption by the human body.
Popcorn is one of the traditional snacks in my country. In the streets in my memory, vendors weave popcorn with hand-shaped popcorn machines. The structure of the popcorn is also simpler. The body part is an oval black iron stove with an opening at one end. Put an appropriate amount of corn or rice into the furnace, close the furnace lid at the opening, and heat the iron furnace. There is pressure on the furnace cover, which can display the air pressure value in the furnace in real time. When the air pressure rises to a certain extent, put the open end of the stove into the bag, open the stove cover, and use "bang" to spray a large amount of popcorn into the bag to pop the popcorn.
Why did rice expand to popcorn?
The rice will expand into the popcorn, which is actually the simultaneous effect of temperature and pressure. In a sealed container, the amount of air inside is constant and when the temperature increases, the pressure in the container increases. This is also the case, and when the iron furnace is heated, the air pressure in the furnace gradually increases; at the same time, the rice in the furnace also has high temperature, and the water in the rice gradually evaporates and is continuously concentrated in the furnace. As the temperature continues to increase, the air pressure in the furnace increases. Under the action of high air pressure, the evaporation of water in the rice is blocked, and the remaining water in the rice also increases in temperature and rises, so that the rice particles are usually in the ball. Since it is also subject to the air pressure in the furnace, the pressure difference is not large enough, so the rice particles have not yet exploded. When the stove rises to 2-3 atmospheres, its heat stops. At the speed of opening the furnace cover, the rice particles under high temperature and high pressure suddenly come into contact with the lower air pressure, and are separated from the binding force of the air pressure in the furnace. The moisture in the rice particles expands, forming a popcorn.
Today, the old popcorn machines have basically been replaced by new puffing processes. It is basically the same, but the equipment of the new process is more advanced, safe and has high production efficiency. It can also be made in various flavors. rich.
The popcorn is crisp and fragrant, but it is not recommended to eat it. There is lead or lead-tin alloy in the old popcorn stove. The lead during the high-temperature process will be released in the form of lead smoke or lead vapor, and it is prone to explosive adsorption. This high-end population is more harmful to the body. In particular, lead is absorbed by the human body, which can damage the nerves, hematopoietic system and digestive system, making children grow slowly, become resistant and the main symptoms are irritation. Anxiety, loss of appetite, diarrhea, or constipation. Nowadays, cinema catering counters are made of popcorn, but some popcorn has too much cream, flavor and other additives, which increases the energy and trans fatty acid content of popcorn, making long-term consumption unhealthy. Small food, eat more, hurt, eat reasonably, meet.