I prepared some experimental instruments first: a transparent glass cup, a spoon, raw eggs and a big pot of salt.
I scooped half a glass of water in the cup first, and then put the eggs in the cup. I saw the egg suddenly sink to the bottom of the cup. Then, I put the salt in the cup and stirred it carefully to make the salt dissolve in the water. I stirred it and suddenly found that the egg left the bottom of the cup, but after a while, the egg sank again. At this time, I put some salt in the cup. I was about to put it on when my mother came back. I immediately began to nag: "You see you are fooling around and not doing anything serious." "No, I'm doing an experiment. I'm doing an experiment on how to make eggs float in water." But when my mother heard this, she quickly handed me a bag of fine salt and said, "Fine salt dissolves faster than coarse salt." So I added a few spoonfuls of fine salt and stirred it gently to make eggs.
When I was dancing with joy, my mother asked me seriously, "Do you know the reason why eggs float?" My mother's problems made my happiness disappear by more than half. I was really tongue-tied and couldn't make any sense. But my mother "forgave" me and gave me time to look up the information myself to find the answer. Later, I found the answer on the internet: when the weight of an object is greater than the buoyancy of water, the object sinks; When the weight of an object is less than the buoyancy of water, it floats. Water has a certain proportion. When we add salt to water, the proportion of water increases. When it reaches a certain value, the specific gravity of water is equal to the weight of eggs, and eggs will be suspended in water. When the specific gravity of water is greater than the weight of eggs, eggs will surface. It turned out that my mother asked me to add salt to the water to increase the proportion of water, so the eggs surfaced.
Hands-on, experiments, brains, and information can really learn skills and acquire knowledge. How interesting!