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

In this cool project, create a lighted, scale model of the different layers of the Sun, including the core, radiation and convection zones, and photosphere.

In this experiment, your child will create two compost bins and see if he can determine what attracts fruit flies.

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.

This conservation of energy demonstration shows why the first hill is the highest on a roller coaster. Learn more about potential and kinetic energy!

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.

Compare the amount of ozone in various locations with this science fair project that will have your kid create her own ozone strips!

Science fair project in which you will create your electricity by making a homemade battery using salt water, a nail, and a copper wire.

How powerful is the reaction between baking soda and vinegar? Find out here!

This science fair project explores how salt and sugar affect the melting rate of ice in water.

This science fair project determines which of two chemical agents can be used to release the drug (tea) from hydrogel crystals.

Discover the interactions of synthetic dyes and natural dyes on natural and artificially-made fabrics.

This science project challenges students to study the salt content in tap water and learn about electrochemistry.

Determine which seeds are most likely to survive harsh winter conditions (low temperatures).

Science fair project that examines the physical features of elephants and butterflies and draws conclusions about their similarities.

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.

In this science fair project, students will use four different household objects to see which ones form the most or best crystals.

In this experiment, students create music with subliminal messaging to try to influence people's decision-making.

This science fair project investigates why the number of visible stars changes from place to place.

What keeps a an item cooler, polymer crystals or ice? Find out in this cool science experiment!

Kids build a rainforest food web to explore trophic levels in this cool science fair project for 4th grade.

Explore the best way to store popcorn kernels. It examines the impact of moisture and temperature on unpopped kernels.

Wind is an important source of renewable, green energy. The purpose of this science fair project is to build and operate a windmill generator.

Science fair project which measures the amount of heat energy released by a burning candle by calculating how many calories of heat it emits.

How do crystals form? In this science fair project, students will use three different saturated solutions to see how different minerals form crystals over time.

Thermometers are how we measure temperature, and we've all heard the terms "centigrade" and "Fahrenheit" tossed around, but what do they really mean?

This science fair project examines which fruits and/or vegetables will ripen prematurely when placed with ripe apples.

Science fair project that creates fog using bottles of hot and cold water.

The purpose of this science project is to determine which chemical best lowers the temperature of water in a cold pack and if the amount affects its use.

What is the Doppler Effect, or the Doppler Shift? The purpose of this science fair project is to determine how distance impacts the Doppler Effect.