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.

  • Visual aid of how to complete Leaf Color Experiment

    With fall around the corner, we've been seeing the leaves in our neighborhood slowly start to change. My kids have had so much fun discovering the new pops of color in our yard. This is absolutely one of our favorite fall science experiments! 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!

  • Visual aid of how to complete Bouncy Egg
    Bouncy Egg

    (Ages 5-16)

    Can you make an egg bounce? Try this simple chemistry experiment and see the shell of an egg dissolve! You'll be left with a surprise and a fun, bouncy egg. 

    Discover everything that eggs have to offer with Eggsperiments from the KiwiCo Store! Use the scientific method with a series of egg-based experiments that explore chemistry, physics, and biology.

  • Visual aid of how to complete Balloon Rocket
    Balloon Rocket

    (Ages 5-16)

    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.

  • Visual aid of how to complete Glowing Oobleck
    Glowing Oobleck

    (Ages 5-16)

    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 activity!

    Have you ever hit some water with a hammer? We’re not sure why you would have, but if you can imagine doing that, you can also imagine that the hammer would make a splash as it goes right into the water. The water doesn’t really push back on the hammer. But what if it did? What if you hit the water, and it stopped the hammer?

    The mixture you’re going to make in this activity does just that. Oobleck is a type of mixture called a non-Newtonian fluid. If you push hard on it (no need to use hammers for this part), it hardens up and pushes back against you. If you push lightly on the oobleck, though, it stays liquidy and your hand will easily go into it.

  • Visual aid of how to complete What Soda Does to Teeth

    Why is soda bad for your teeth? My kids keep asking why they can't have more soda. The tooth fairy was kind enough to lend us some baby teeth for us to experiment with, and we got some very interesting results.


Get inspired!