In this plastic wrap science fair project, you'll learn about polymer permeability and find out which plastic wrap keeps food from dehydrating best.

In this science fair project, we learn how air molecules move as a result of density, convection, and air currents.

This science fair project enhances the understanding and awareness of energy use and explores the concept of energy efficient.

The buoyant force of water explains why some objects float in water. But why do some objects sink? Find out in this physics experiment and learn about density.

Engineers in training can get started with this simple wheel-and-axle construction activity.

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

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

In this cool experiment, learn how to find specific gravity of minerals using liquids of different densities to see which substances and items sink and float.

The objective of this project is to evaluate whether a top will spin at different rates during different phases of the moon.

This is a quick, easy science fair project that conveys the idea of density to upper elementary students.

In this science experiment, your child will test the strength of hollow structures in order to understand how strong bird bones really are.

Before Twitter, birds were the ones tweeting, not humans. Have your child discover the magical sounds of nature while recording birds around his neighborhood!

The objective of this science fair project is to investigate salt water density.

The science project fair idea explores the interaction between your nose, mouth, and brain when tasting a new food or drink.

In this free science fair project idea, we learn about surface tension and how it can support mass—in this case, a floating paper clip.

Science fair project that examines the different types of precipitation, evaluates the density of snow and calculates the ratio of snow-to-liquid.

This easy aerodynamics activity is a simple way to introduce kids to the scientific method.

Explore the relationship between personality traits and birth order effects.

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

This science fair project idea compares the mass and density of objects.

The project investigates how water and movement affects erosion.

This experiment uses Rosenberg's Self Esteem Scale to evaluate if there is a correlation between family size and self esteem.

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

This science fair project idea examines the distance a person travels on an average day and to relate that to an understanding of the size of the Earth.

In this CD hovercraft science project, students will construct their own DIY hovercraft.