write a explanation on how " Because of the salt, the egg's distance from the cup's bottom varied over time."
When an egg is placed in a cup of water, its buoyancy and position in the water is determined by the density of the liquid. When salt is added to the water, it increases the overall density of the liquid. As a result, the egg's buoyancy changes and it may sink or float at different levels within the cup.
As the salt dissolves in the water, it becomes more concentrated near the bottom of the cup. This concentration gradient creates a variation in the density of the liquid at different depths. Since the egg's buoyancy is affected by the density of the water, its distance from the cup's bottom will vary as the salt continues to dissolve and disperse throughout the liquid.
Therefore, the egg's position in the cup will fluctuate over time as the salt diffuses and alters the density of the water. This variation in distance from the cup's bottom is a result of the changing buoyancy of the egg in response to the salt concentration in the liquid.