SCIENCE EXPERIMENTS

Density tower: 

Density towers are a simple and fun experiment you can do at home to demonstrate the density of liquids. Substances that are more dense create the base of the tower, while substances that are less dense seem to float in the middle and on top.

SINK or FLOAT: EGG

For this activity:

1. You will need: 2 similar sized eggs, 2 identically sized tall containers or glasses, water, salt.
2. Begin with observing the 2 eggs. In order to make the experiment fair, they need to be the same size and weight and both must be raw eggs. Discuss – do you think that the eggs will sink or float when placed in water? Do you think it’s possible to make them float? If so, how can this happen? Write down your hypothesis (prediction).
3. Fill one glass about 3/4 full of water and carefully place the egg into the glass. What happens to the egg? In pure water, the egg will sink.
4. Fill the second glass with the same amount of water. Add 3 Tablespoons of salt and stir until completely dissolved. What do you think will happen if you place the egg into the glass with the salt water? Observe the egg floating. Discuss – why did this happen?
5. The egg will sink in regular tap water because the density of the egg is greater than the density of water. By adding enough salt, you increase the density of the water so that it is higher than the density of the egg and the egg will float.

Oobleck

Here's nothing complicated here, which is part of the charm of oobleck. The ingredients are inexpensive and safe.FEATURED VIDEO0 seconds of 3 minutes, 25 secondsVolume 0%Loading ad How to Make Slime

• Water
• Cornstarch
• Food coloring (optional)

How to Make Oobleck in Your Kitchen

1. Mix 1 part water with 1.5 to 2 parts cornstarch. You may wish to start with one cup of water and one and a half cups of cornstarch, then work in more cornstarch if you want a more 'solid' oobleck. It will take about 10 minutes of mixing to get a nice homogeneous oobleck.
2. Mix in a few drops of food coloring if you want colored oobleck.

Tips for Great Oobleck

1. Oobleck is a type of non-Newtonian fluid called a dilatant. Its viscosity changes according to the condition to which it is exposed.
2. If you slowly lower your hand into oobleck, it will sink, but it is difficult to quickly remove your hand (without taking all the oobleck and its container with you).
3. If you squeeze or punch the oobleck, the starch particles will not move out of the way quickly, so the oobleck will feel solid.
4. Oobleck can be molded in a container, but when the mold is removed, the oobleck will lose its shape.
5. Feel free to mix in glitter or to substitute glowing water for regular water to make oobleck.