This science fair project idea explores the relationship between oil and water in terms of density as well as hydrophilic/hydrophobic compounds.

In this fun science fair project, make two different scale models of our solar system using Astronomical Units and planets' relative size!

This project examines who can jump higher, boys or girls, younger people or older, and how these two factors, gender and age, interact with one another.

Learn about how we localize objects and beings in space through sound and about monaural auditory mechanisms and binaural auditory mechanisms.

Science fair project that identifies the nature of ionic and covalent bonds and determines how ionic and covalent compounds differ.

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

This science fair project idea explores what common compounds can be easily separated out in a centrifuge.

This science fair project idea investigates emulsifiers that allow oil and vinegar to mix.

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.

Determine how we can separate the components of a solution

In this project combining nature, art, math, and science, children make rubbings of leaves then observe shapes and structures and sort the leaf images.

Learn about magnifying glasses, concave lenses and inverted images by sending rays of light through a magnifying glass in this cool science fair project!

Demonstrate that insects observe colors and choose favorites. Place colored pieces of construction paper on a flat, glassy surface, observe bug preference.

Science fair project that examines oxidation, reduction and chemical indicators by testing for the presence of the iodide in salt.

This science fair experiment idea's objective is to understand the general concept of an acid and a base.

In this science project idea learn about working of different types of smoke detectors and find out which one is the most effective for you.

This science fair project idea identifies trees using a dichotomous key.

Science fair project that uses distillation to convert salt water into fresh water.

Kids will conduct a cool limewater carbon dioxide test that can be performed with common household materials to learn about the chemistry of this common gas.

Kids love the dramatic Mentos and Diet Coke experiment conducted in this awesome science fair project.

The project examines absorbent polymers absorbency in disposable diapers and their unique ecological problem to the environment.

In this project, build an insect model that shows how the head, thorax, and abdomen fit together! Learn insect anatomy by constructing a paper mache critter.

In this project, several food items are tested to determine whether they contain starch.

In this science experiment, test the pH of soil surrounding a gas station to determine if gas stations have a negative effect on the environment.

Total alkalinity and pH personal care products are controlled to prevent skin irritation. Learn more about basic and acidic substances in this science project.

What combination of cloth and stain will be the easiest for removing stains? Test and experiment!

Why do ants like sugar? Do ants like artificial sweeteners too? Kids find out with this great inquiry-based science fair project.

Quench your thirst with great tasting lemonade while you explore the concepts of acid and base, and how these differ from sweet and sour.

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.

In this fun science fair project idea learn about universal solvents and solutes and find out the solubility of several common liquid substances.