Why does an egg sink in regular tap water but float in saltwater? The answer lies in the density. This is the concept that 4th Class set about exploring today for one of their experiments during Science Week. They discovered that the egg sank in regular tap water because the density of the egg is greater than the density of the tap water. However, when they added salt to the water, they increased the density of the water and so the egg sank to the bottom!
