Here’s a simple science experiment. Fill a jar of water halfway. Gently try and float an egg in the water.
The egg sinks. Now stir 5 to 7 teaspoons of salt into the water until it dissolves. See what happens if you try and float an egg in it now!
The egg sinks the first time because it is denser, or heavier than the water. When you add salt to the water it becomes more dense than the egg, so the egg floats!