Explore solids and liquids with your young scientist by making gluep, a goopy substance that can behave like both a solid and a liquid!

Is it solid or liquid? Create oobleck and witness the amazingly weird oscillation between the two!

In this sound experiment children listen for differences as they tap on a bag of air, a bag of water, and a wooden block held up to their ears.

Water can go from solid to liquid to gas...but how does popcorn go from kernel to snack? Invite your first grade scientist to find out.

How much gas is released into your stomach by your favorite beverages? This project examines which beverages produce the most gas.

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.

Your child helps the environment while saving your family money in this fun and rewarding "Gas Guzzlers" competition.

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

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

Get your hands on a concoction that breaks the rules about what's a solid and what's a liquid.

How does dishwashing liquid work? Kids discover the chemical mechanism behind cleansing power in this easy science fair project idea.

What's a liquid? What's a solid? What better way to experiment than by turning a childhood favorite, ice cream, into a homemade science lesson!

Use the activity below to help your child create bath salts as she observes how a solid changes when placed into a liquid.

What are the effects of fertilizer on plant growth? What's the best fertilizer type (solid, liquid or powder)? Kids find out in this science fair project idea.

Teach your first grade scientist the difference between liquids and solids using maple syrup.

Check out this fun science fair project idea for middle school students to learn about the effects of temperature on the density of a gas such as air.

Would your child like to learn about a hidden world? All she needs to do is open her box of markers!

Science fair project that examines how yeast grows, and which conditions allow for optimal growth. What types of nutrients does yeast prefer?

The objective of this science fair project idea is to examine light refraction as it passes through liquid crystals.

This classic children's game demonstrates how sound travels through air vs. through a solid.

This project examines how temperature affects the volume of gas in balloons.

Determine whether a hot liquid cools off faster when liquid is added before or after a two minute wait.

Science fair project which examines the chemical reaction of a candle flame with various gases in order to determine the identity of the gas.

Try this experiment to give your curious kid a more "solid" understanding of how temperature affects the states of matter.

Study how liquids separate into layers by creating a liquid gradient, different density liquids separate into layers in a graduated cylinder.

Teach children how to upcycle dried-out markers with this homemade paint-making activity!

The objective of this science project is to determine the relationship between carbon dioxide gas and the temperature of the atmosphere.

The objective of this science fair project idea is to determine if sound travels best through the air, water or a solid.

Science fair project that examines how temperature affects density and how density in turn affects the behavior of helium gas.

What is the coldest temperature possible? In this cool experiment, you'll calculate absolute zero by extrapolating data on the temperature and volume of gas.