Rice flowers carry the joy of childhood for many people. Most children who lived in rural areas when they were young had this experience. When they heard the sound of "Bang! Bang! Bang!" outside, or heard the old man making popcorn shouting, they hurriedly asked their mother for some. A bag of corn or rice and run out to find where the popcorn is.

While rubbing hands with a group of friends and waiting for the popcorn in the boiler to be heated, the uncle said "cover your ears" and waited to hear the loud noise. How many people have been scared by that black boiler? This kind of old-fashioned popcorn machine is actually officially called "Cannon Hand Popcorn Machine". Nowadays, we can no longer see this kind of popcorn machine in cities. It can only be found in some museums or remote mountainous areas. Traces of it can be found. But this old-fashioned popcorn machine was not invented in my country, but by the British in the late 19th century, so it is also called a British popcorn machine.

It was only in the electrification era of the 20th century that this kind of popcorn machine was retired from Western countries, but in China it became a childhood memory of a generation. The working principle of this popcorn machine is to change the pressure inside the machine. Due to the heat, the pressure inside the machine slowly increases. When people open the cover, the high temperature and high pressure inside the machine are erupted together with the processed raw materials. The external pressure Rapidly falling, the gas inside the corn kernels rapidly expands outwards, and the corn kernels turn into popcorn. As a result, this hand-operated popcorn machine has become something that many people love and hate in their childhood. What they love most is that it can turn corn, rice, yellow rice, and broad beans into fragrant and crispy popcorn. Put some sugar and it’s a delicious little snack. What I hate is the loud noise at the moment when the cover is opened, which makes many people jump up in fright to calm their racing hearts. However, this loud noise stopped in the childhood of many people. Now, with the birth of newer popcorn machines, the loud noise in childhood has gradually receded with the hand-cranked popcorn machines.

Why do new popcorn machines no longer make such loud noises? The popcorn we eat now is completely different from the popcorn we used to make with a bag of corn at home. The popcorn we make ourselves uses ordinary edible corn. This kind of corn needs a higher popping temperature and a high-pressure environment to make the corn into popcorn. Therefore, we need a hand-cranked popcorn to give the corn popcorn. A high-pressure environment. The popcorn sold in movie theaters now is American popcorn, and the corn used is special small-grained popcorn. This kind of corn originated in the United States, has smaller particles, a harder skin, and a moisture content of about 14%. This kind of popcorn pops at a relatively low temperature and does not require a high-pressure environment. It only requires simple heating to expand the corn and break through the outer shell to form popcorn. Moreover, the popcorn produced is whiter in color, softer in taste and of better quality.