Science Fair Projects for 9th Grade

These science fair projects for 9th grade are perfect for older kids to explore advanced science concepts and tinker with some more exciting materials.

1. Pressure Bottle Rocket

Water squirters work by pressurizing reservoirs of water with air. As you pump the squirter, it gradually adds air to the reservoir, increasing the pressure. When you pull the trigger, the pressure is allowed to release and a stream of water shoots out!

The pressure bottle rocket works thanks to Newton’s third law of motion, which states that for every action, there is a reaction. As you pump up your rocket with air, pressure builds up inside. Eventually, this pressure pushes the rocket off of the cork and bicycle pump, and expels the water in the bottle downward — this is the action. The reaction to this downward movement of the water is the rocket’s own upwards movement, sending it high into the sky.

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2. Flying Teabag

Make a tea bag fly with heat! The flying tea bag experiment is a similar concept to a hot air balloon, but you can do it right at home.

Did your tea bag lift into the air? When the tea bag was lit, the flames started to heat the air within the teabag. The heated air rose above the cooler dense air (similar to a hot air balloon!). Once the teabag was burned, we were left with the lightweight ashes of the tea bag. The lightness of the ashes combined with the heated air caused the tea bag cylinder to lift into the air.

3. Flaming Torch

Create a whirling fire torch of your own. The flames spin upwards into a vortex from the rising heat and wind. Follow along to safely create a whirling fire torch yourself!

Stand back and watch your fire form a helix. Experiment with the spinning speeds to see how it affects the shape of the flaming tornado! The flame will last a few seconds and eventually die out as the paper towel burns. Exercise all caution while the flames are live. The beaker may be very hot so use tongs to keep your fingers safe!

4. Electromagnet

Give this experiment a try, and see how many paper clips you can pick up with your electromagnet!

Unlike the magnets that are used on refrigerators, electromagnets are magnets can be turned on and off depending on the flow of electricity. The electricity that flows through the wire allows the molecules on the in the nail to attract to certain things.

5. Rubber Band Racer

Using simple household materials and tools, it’s super easy to create a rubber band powered racer and experiment with wheels, rubber bands, and different surfaces to see how fast your racers can go!

To wind up your car, carefully turn the large wheels of the car so that the rubber band winds around the back axle. Let go and watch your car spin off!

Continue experimenting with your car and try different size and length rubber bands. What combination works the best?

For more amazing science fair projects, be sure to check out:

Science Fair Projects for 3rd Grade

These science fair projects for 3rd grade allow kids ages 8-9 to explore science concepts from plant biology to Newtonian physics.

1. Leaf Color Experiment

Simple and quick, this experiment teaches kids about color in leaves. If you are a parent of curious kids, be sure to give this experiment a try!

Leaves are full of chlorophyll, which works to for convert the energy of the sun into food for the plant. Chlorophyll also makes leaves appear green. They have other colors in them as well, but as long as there’s lots of chlorophyll, the green hides all the other colors. However, in the fall the chlorophyll in the leaves starts to break down. This allows other colors such as yellow, and orange to make their appearance!

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2. Bouncy Egg Experiment

Want to see a chemical reaction in action? With this egg in vinegar experiment, we observed and followed a regular egg through a transformation to become a bouncy egg.

You’re seeing a reaction between a compound in the eggshell (calcium carbonate) and an acid in the vinegar (acetic acid). This reaction creates carbon dioxide (and some other things) and breaks down the eggshell in the process. The membrane underneath the shell doesn’t react, so it’s left behind. Once the shell is completely gone, all that’s left is the flexible membrane, giving you a bouncy “rubber” egg!

3. Balloon Rocket

Create your very own balloon powered rockets and see how far they can travel.

Experiment with different balloon shapes and sizes to experiment with the travel speed.

4. Glowing Oobleck

Discover non-newtonian fluids (substances that act as both a liquid and a solid) and liquids that glow under black light with this messy, but delightful science fair project!

Oobleck is called a non-Newtonian fluid because it can change its viscosity. Viscosity is a property of liquids that says how fast they flow or how much they resist their shape changing — kind of like how thick a fluid is. Isaac Newton wrote a law a long time ago that said a liquid’s viscosity was supposed to be a constant (unless you change its temperature). Because he never tried making oobleck, he didn’t know that a changing viscosity was possible!

You can test out viscosity at home by trying to stir different liquids. If it’s tough to stir, it has a high viscosity. If it’s easy to stir, it has a low viscosity. And if its viscosity changes and it gets harder (or easier) to stir, then you’ve found another non-Newtonian fluid!

5. What Soda Does to Teeth

Why is soda bad for your teeth? Find out why with this experiment and some baby teeth!

It’s interesting to see how the different sodas (and even water!) can have such damaging effects on your teeth — a valuable reminder of why it’s so important to brush your teeth!

For more amazing science fair projects, be sure to check out: