1. Prepare experimental materials: clear water, long glass, pigment, raw eggs, salt and stirring rod.

2. Pour the water into the glass, and then add the raw eggs. You can see the raw eggs sinking under the glass. The reason why the egg immediately sinks into the water is because the density of clear water is relatively small, and the buoyancy of water is less than the gravity of the egg itself, so the egg sinks to the bottom under the action of gravity.

3. Take another glass, pour about 100ml of water, then pour 50ml of salt and stir until dissolved, and then add raw eggs.

4. Pour 60ml of water into the measuring cup, and add a proper amount of pigment and mix well.

5. Discharge the pigment water into the salt water cup with a glass rod and observe the phenomenon. You can see paint and eggs floating on the glass. Adding salt to clean water will increase the density of liquid in the cup, thus increasing buoyancy. When the buoyancy is greater than the gravity of the egg, the egg floats on the water and can't sink any more.

Principle:

When the egg volume is constant and the liquid density increases, the buoyancy increases accordingly. Adding salt to water will increase the density of liquid, so eggs will float in salt water. That is to say:

1, the density of salt water > the density of eggs, the eggs will float.

2. The density of salt water = the density of eggs, so the eggs are suspended in the liquid.

3. Density of brine