The reason why dumplings float on the water after they are cooked is because the volume becomes larger, the density becomes smaller, and thermal expansion and contraction occur, so they float on the water. Dumplings and glutinous rice balls are our daily favorite delicacies, because they are relatively easy to make. When we judge whether the dumplings are cooked, we can usually tell it with our eyes. The dumplings that have just been cooked will sink to the bottom of the pot, and After the water boils, it will float on the water, and then we can eat it after renting it for a minute or two. In fact, when our dumplings float on the water, it means that the meat inside and the dumpling wrapper are already cooked. So we can eat it with confidence. The reason why this phenomenon occurs is because the dumpling skin expands and contracts with heat during the cooking process. Its density is smaller than that of water, so it rises to the surface of the water. , next I will give you a good explanation from several aspects.

The reason why cooked dumplings float on the water is because they expand. Dumplings have been a classic pasta in my country for nearly 2,000 years. No matter what festival is celebrated, people like to eat some dumplings. As traditional dumplings, we only need to boil them in water and then float them to eat. During the process of cooking dumplings, because the gaps between flour molecules become larger, the density of the entire dumpling becomes smaller. When the density of the dumpling is less than the density of water, it will float on the water.

The reason why cooked dumplings float up is because they absorb some air inside, making them larger in size. In the process of continuously heating the dumplings, some gas will be inhaled inside the dumplings, causing the volume to become larger. Using the formula of buoyancy in junior high school, we can conclude that when the volume of an object is larger, the buoyancy force it experiences will be greater. , so when it reaches a certain level, the cutin will automatically surface.

In fact, we don’t care about these precise calculations at all. We only need to know that when the dumplings float, cook them for another minute or two and then eat them.