In this experiment, students find out what happens when a less-dense fluid interacts with a denser one, replicating the effect of cooler solid rock on magma.

This science fair project idea demonstrates how air resistance contributes to denser objects falling faster than less dense objects.

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.

This cool science fair project teaches kids about temperature, density and buoyancy using balloons that float with normal air. No helium required!

In this air pressure science experiment with a balloon and a jar, children will use heat to create a partial vacuum and suck a balloon into a jar.

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

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

In this physics project, learn about the relationship between light intensity and distance using a laser pointer, flashlight, and graph paper!

Get this cool science fair idea to explore how arctic tundra animals change their behavior and adapt to survive in long, cold winters.

Science fair project about work and energy which uses a simple mathematical formula to predict how far a jar will roll down an incline.

This is a quick, easy science fair project that conveys the idea of density to preschool and early elementary children.

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

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

Discover whether the â5-second ruleâ is effective at determining whether food is still safe to eat after being dropped on the ground.

Learn how to make an anemometer with step-by-step instructions in this cool science fair project idea for 4th grade.

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

This science fair project idea investigates which objects float and sink in honey, water, and oil.

This science fair project idea determines if the size of the parachute will change the rate at which an object falls.

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

Step into the fantastic world of colors with a project that explores what shade you -- and your friends -- like best.

This science fair project idea investigates the difference in reaction times between boys and girls.

The goal of this golf science fair science fair project is to determine whether the temperature of a golf ball affects its elasticity and its rebound.

This science fair project idea explores how the shape of a boat affects its density and how much weight it can float.

Learn about the fruit fly life cycle in this experiment. Capture fruit flies to examine various stages of insect metamorphosis.

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.

This science fair project idea investigates if fats add to the flavor of food.

Kids will make predictions about cricket behavior by conducting this fun and easy experiment which simulates different environments for crickets.

Science fair project that determines whether cooling eggs helps them be peeled more easily. Compare the time it took to peel each egg.

This science fair project teaches kids experimental design and how to test if subjects can really sense if they are being watched.

Is cleaning with lemon effective? Get ready to give this science project some elbow grease and find out if acidic lemons can be used as a cleaning agent.