In this science fair experiment, children demonstrate the relationship between the amount of stuff and the amount of pressure in a closed system.

What do ants eat? Kids find out by observing a colony of ants in this cool zoology science fair project for 4th grade.

This light bulb science project includes step-by-step instructions for testing the heat from different light bulbs.

Learn how to demagnetize a magnet and how physics can explain this phenomenon with this enlightening science fair project.

This science fair project idea investigates how optical distances change the apparent size of an object as seen through a magnifying lens.

The objective of this science fair project is to explore the relationship between acidic and basic compounds.

Find out whether a longer airplane will fly farther or a wider paper airplane.

Check out this fun and easy 4th grade science fair project idea that tests how gravity induces positive and negative geotropism (gravitropism) in bean plants.

Kids will explore the corrosiveness of soda in this cool science fair project by leaving pennies submerged in soda overnight.

Understanding absorption means understanding why certain fibers and materials can absorb water! Kids will see absorption in action in this simple project.

This project explores whether nails, toothpicks, straws, or pen nibs are best for applying ink to paper.

The purpose of this study is to determine if people can tell the difference between organic and conventional food from looking at, smelling and tasting it.

This science fair project idea explores the egg's thin membrane.

This science fair project idea explores how enzyme inhibitors, active sites, non-competitive enzyme inhibitors, and substrates work.

This science project teaches students to classify different shapes of leaves.

This science fair project idea highlights decomposition rates by comparing how long it takes an item to decompose in a compost pile vs. a landfill.

In this science fair project, students discover how sedimentary layers form as sediments like mud, silt and sand settle over time.

This science experiment tests whether warm or cold water works best in making cut flowers last longer.

In this popcorn experiment, students can explore how two things made out of the same material can have very different appearances and densities.

Can a toy car determine the strength of a magnet? In this cool magnet science fair project, young scientists will learn how to measure the strength of a magnet.

Science fair project which determines whether the size or the thickness of a piece of paper has an effect on how many times it can be folded in half.

When you cut a flower to put into a vase, it'll eventually wilt, even with water and sunshine. But is there another scientific secret to keeping flowers fresh?

Kids explore how a single movable pulley can confer a mechanical advantage over a fixed pulley in this cool engineering science fair project for 2nd grade.

Milk is made of water and fat; but how can you separate the two? Find out in this color changing milk experiment.

Discover how and which salt melts ice the quickest.

This fun and easy middle school science fair project idea explores the topic of pollution and demonstrates if polluted soil affect the growth of green plants.

The objective of this science fair project is to examine the effects of temperature on salt and water solutions, as they form crystals over time.

Free science fair project idea that examines the differences between cats and dogs. Analyze objective qualities rather than subjective ones.

The goal of this evaporation experiment is to learn about how different external conditions affect drying time.

In this free science fair project, learn how to separate salt from water using heat. A great science project for elementary school kids.