Heat in microwave.

The reason why rice expands into popcorn is actually the simultaneous effect of temperature and pressure. In a sealed container, the amount of air inside is constant. When the temperature increases, the pressure inside the container increases. When the iron stove is heated, the pressure of the air sealed in the stove gradually increases. At the same time, the rice in the stove is also subjected to high temperatures. The moisture inside the rice gradually evaporates and is released, and continues to accumulate in the stove. As the temperature continues to rise, the air pressure in the furnace also increases.

Because it is also constrained by the air pressure in the furnace, the air pressure difference is not large enough, so the rice grains have not exploded for the time being. When the air pressure in the furnace rises to 2-3 atmospheres, heating will stop. At the moment when the furnace cover is opened, the rice grains in a high temperature and high pressure state suddenly come into contact with a lower air pressure environment, breaking away from the restraint of the air pressure in the furnace. The moisture in the rice grains expands rapidly, forming popcorn.

Extended information:

Notes:

1. It is best for pregnant women to eat less popcorn, because the saccharin contained in popcorn is harmful to the growth and development of the fetus. unfavorable. In addition, popcorn is relatively dry, which can easily cause inflammation. Therefore, two-foot popcorn is not suitable for pregnant women during pregnancy, especially because some of the substances contained in it have a great impact on the development of the fetus.

2. The trachea of ??infants and young children is very thin, and eating popcorn can easily get stuck in the baby's trachea. Therefore, do not give popcorn to babies under 4 years old. Parents should supervise their children when eating popcorn.

3. In addition, popcorn can increase dietary fiber intake and help strengthen teeth. Because popcorn with a strong fragrance contains more flavors and additives, including artificial butter, It is not conducive to the health and development of children, and it can also cause gastrointestinal discomfort in children with poor digestive ability.

Baidu Encyclopedia-Popcorn