An egg sinks to the bottom if you drop it into a glass of ordinary drinking water but what happens if you add salt?
What you'll need:
- One egg
- Water
- Salt
- Drinking glass
Instructions:
- Pour water into the glass until it is about half full.
- Stir in lots of salt (about 3-4 tablespoons).
- 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)
- Gently lower the egg into the water.
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.