The principle of eggs floating in salt water is that because the density of eggs is less than that of salt water, eggs will float in salt water. Buoyancy is related to the volume of the object immersed in the liquid and the density of the liquid. The volume of an egg is fixed, so if salt is added to the liquid, the density of the liquid will increase until the density of the liquid is higher than that of the egg, and then the egg will float.
From the relationship between force and motion, when an egg is submerged in water, its buoyancy is less than gravity, and the resultant force is downward, so the egg sinks, while when it is submerged in salt water, its buoyancy is greater than gravity, and the resultant force is upward, so the egg floats, and the decrease of buoyancy is equal to gravity, so the egg will float on it.
Other low-density experiments are recommended.
Liquids with different densities are not easy to mix. The liquid with high density is heavy and will sink to the bottom, while the liquid with low density floats on it. Honey, water and oil have different densities, with honey having the highest density and oil having the lowest density. The three liquids are mixed together, showing the effect of stratification. Liquids with different densities have different buoyancy, so objects will stop in different places after being put into different objects. In the factory, the liquid that can't touch the air will be protected by a layer of oil.
Density is one of the characteristics of matter. Every substance has a certain density, and the density of different substances is generally different. The human body density is only 1.02g/cm? Only slightly denser than water. Gasoline is less dense than water, so any oil stains you see on the road will float on the water. The density of seawater is greater than that of water, so the human body floats easily in seawater.