- Large Beaker or drinking glass
- 1 egg
- 1-2 cups salt (Depends on the size of the beaker or drinking glass)
- Stirring Utensil
What To Do:
- Pour water into beaker or glass until it is half full
- Place egg into water (to demonstrate that the egg will sink)
- Add salt to water and egg (begin with about 6 tablespoons)
*If egg does not float, add more water and salt gradually until the egg floats*
Location and Appropriate Age Group:
- This demonstration does not make a mess, nor does it require much clean up, so this demonstration can be done anywhere.
- This demonstration works well for younger students (ages 5-7), but with more in depth explanations about why this demonstration works it can be used with older students as well.
How It Works:
- Salt water is denser that ordinary tap water, and the denser an object is the easier it is for an object [such as an egg] to float in it.
- The salt water will stay towards the bottom of the beaker or glass, and the tap water will remain at the top of the glass, when the agg is mixed into the solution it essentially rests on the denser salt water and appears to float in the middle of the glass.