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You may not believe this but you can squeeze a raw egg in the palm of your hands and it will not break, yet when you tap it on the edge of something it will.
Take the raw egg in your hand and place it in your palm.
Wrap your fingers around the egg and squeeze.
When you apply even pressure to the outside of the egg, it will not break. It is only when you apply force to one part of the egg, that it will break.
Warning: Preschoolers should only try this when standing over a bowl and with adult supervision.
For this experiment, you will need a narrow-mouthed jar (slightly smaller than the egg), a hard cooked egg, a votive candle and some long wooden matches.
Peel the egg and show your children that it will not fit into the jar.
Now place a votive candle inside the jar and carefully light the candle.
Replace the egg to the mouth of the jar.
Have your children observe how the egg is slowly pulled into the jar.
How does this work? Well, when the candle burns inside the jar, it uses up all the air in the jar. This reduces the air pressure in the jar. Now the air outside the jar is greater than the air inside the jar and the outside air slowly pushes the egg into the jar. Note: Expect to throw away the egg and the jar after the experiment.
In this experiment, your children will be trying to discover which of two eggs is raw and which is hard boiled.
Set out two eggs. One raw and one hard boiled.
Ask your child if she can tell which egg is hard boiled (without cracking the egg).
Have your child try, smelling it, lifting it, shaking it, rolling it, laying it on itís side and spinning it.
Finally, have her hold the eggs up and spin them like tops.
Have her notice that one egg spins nicely and one flops over.
Explain that hard boiled eggs can spin easily because they are solid inside, while raw eggs wobble because they are liquid inside.
For this activity, you will need a raw egg, vinegar and a small plastic glass.
Have your child place the egg in the glass.
The, have him pour vinegar over the egg until it is covered.
Set the glass aside for two days.
Pour off the vinegar and dry off the egg with a paper towel.
Have your child squeeze the egg.
Have him notice that the egg now feels and acts like rubber.