Humorous Quick Reads About Families With Kids

Fun Science Experiments for Preschoolers

Published August 17, 2020 in Kids Activities - 1 Comment
fin science experiments for kids - leak-proof bag

Fun science experiments for preschoolers combine a WOW moment with a scientific principle. This is important, of course, because young children learn more readily if the educational activity is fun. If we make the experiments entertaining, kids will develop a lifelong love of science.

Leak-Proof Bag

How can you poke a hole in a bag of water without it leaking? Anytime you create a hole in a container holding water, it springs a leak, right? Not if the container is self-sealing.

For this experiment, gather your supplies: (1) zipper bag, (2) water, (3) sharpened pencils, (4) pan to hold leaks.

Fill plastic bag with water and zip closed. Hold bag over a pan or bowl. Insert pencil into one side of bag and out the other. It doesn’t leak! Try it again with a couple more pencils.

Why doesn’t the bag leak?

When the pencil pierces the bag, the plastic immediately creates a seal around the pencil. Consequently,  the bag does not leak. Have your preschooler pull the pencils out and see the bag begin to leak, proving it really has holes in it.

For another version of this experiment, watch: Leak-Proof Bag – Cool Science Experiment.

Density in a Glass

Another experiment involving water in a container explores density in a glass. For this project, you need: (1) clear container (glass or plastic), (2) honey, (3) water, (4) food coloring, (5) cooking oil. Also collect objects of varying density. We used a marble, a grape, a plastic ring, and a ping pong ball.

First, pour some water in a cup and add some food coloring. Second, fill glass 1/3 full with honey. Next, add the colored water to the glass until it is 2/3 full. Last, pour in the oil, leaving some space at the top of the glass.

These liquids all possess different densities. Honey is the heaviest, so it stays at the bottom. Oil, however, is the lightest, so it rises to the top. Water weighs between the two, therefore, it lays between the honey and the oil.

Next, test the density of various objects. First, pick up the marble. Let your preschooler guess where the marble will end up in the glass. Next, drop the marble in and watch it sink to the bottom.

Repeat the process with the grape, the plastic ring, and the ping pong ball, letting your child guess the resting place of each object.

After you drop all of the objects into the glass, observe where they float. The marble is denser than all of the  liquid, so it stays on the bottom. The grape, however, has a density between honey and water, so it floats on top of the honey. The plastic ring, in turn, is denser than the oil, but lighter than the water, so it floats on the water. Lastly, the ping pong ball is less dense than everything, so it floats at the very top.

Problems with Fun Science Experiments

Leak-Proof Bag: Be sure to sharpen the pencils before you start. Dull pencils will not work.

Density in a Glass: The original experiment called for a Lego brick instead of a plastic ring. Maybe we had a defective Lego, because ours floated on the oil! If you have a problem like that, do what we did. Gather other objects in your home and find one that floats between the oil and the water.

For more fun science experiments for preschoolers, see Science Experiments for Kids – QWK Week 7.

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