For 5th, 6th & 7th Std. Students Science Experiments: Make an Egg Float in Salt Water

Science Experiments
Make an Egg Float in Salt Water
An egg sinks to the bottom if you drop it into a glass of ordinary drinking water but what
happens if you add salt? The results are very interesting and can teach you some fun facts
about density.
What you’ll need:
 One egg
 Water
 Salt
 A tall drinking glass
Instructions:
1. Pour water into the glass until it is about half full.
2. Stir in lots of salt (about 6 tablespoons).
3. Carefully pour in plain water until the glass is nearly full (be careful to not disturb or
mix the salty water with the plain water).
4. Gently lower the egg into the water and watch what happens.
What’s happening?
Salt water is denser than ordinary tap water, the denser the liquid the easier it is for an
object to float in it. When you lower the egg into the liquid it drops through the normal tap
water until it reaches the salty water, at this point the water is dense enough for the egg to
float. If you were careful when you added the tap water to the salt water, they will not have
mixed, enabling the egg to amazingly float in the middle of the glass.