Hand-cranked popcorn means those situations where the payoff does not match the payoff.

"Hand-cranked popcorn" in the Chinese Internet context originally referred to a way of making popcorn, in which the kernels of rice are shaken manually in a frying pan to make them pop at high temperatures. However, in online language, this phrase is often given a derived meaning, which is a metaphor for those simple, repetitive and ineffective labor, or those seemingly busy but in fact not much substantive results of the work. Sometimes the term is also used to tease about situations where the effort is put in but the returns are disproportionate.

When using such expressions, attention should be paid to the context and the audience to avoid conveying a sense of disrespect for labor or disrespect for certain professions. Under the leadership of socialist core values, any form of labor should be respected, and workers should be reasonably rewarded and recognized by society.

A brief description of the principle of hand-cranked popcorn:

The principle of the hand-cranked popcorn machine is based on the principle of pressure and temperature change in physics. Specifically, the hand-cranked popcorn machine works by placing the corn kernels into a sealed container, which is usually equipped with a heating device that can be shaken manually to evenly heat the kernels. In the heating process, the pressure inside the container gradually increases, and the water in the corn kernels gradually evaporates with the rise in temperature and is converted into water vapor. When the internal pressure reaches a certain level, the pressure difference between the inside and outside of the corn kernel becomes large.

At this point, if the container is opened quickly, the high-pressure water vapor inside the corn kernels will expand rapidly, causing the kernels to instantly pop and form fluffy popcorn. This process is similar to how a pressure cooker works, but the popcorn maker is specifically designed to make popcorn, making the process faster and more efficient.