Why and how did the density of water change when salt was added to it?

I think the density of the water changed when salt was added to it because salt has mass.

Density is equals to mass divide by volume. So if there is more mass, then density will increase.

Back to the experiment: So, when salt was added in, there was more mass in the glass beaker, making the density increase. Once density increases, things float. The tap water's density was lower than the eggs, so the egg floated. But, once salt was added in, the density increased, making the density of the water greater than the egg. Thus, the egg floated.

I went to this website too to find out more: http://www.reekoscience.com/Experiments/FloatEggInSaltwater.aspx :-D

Written by:Ethan Teo