Encourage your child to compare and contrast a wide variety of autumn-themed items by weighing various objects and recording their findings.

Determine whether fresh vegetables have more calories or less calories than canned vegetables.

Will your liquid weigh less once you remove the fat from it? Find out in this science fair project idea.

Fudge is one of very few desserts people make at home that is actually crystalline. What happens when the fudge crystallizes at different temperatures?

Learn about calorimetry, make a bomb calorimeter, and experiment with combusting different nuts to see which one produces the most energy!

This science fair project looks one of the most important factors affecting seed germination: water. A fun and easy plant biology experiment for 3rd graders.

Determine whether magic salt is more effective at melting snow than regular salt. Pour one ounce of salt over the ice cubes, compare the melt downs.

This measurement activity uses feet to compare objects, but not the ones found on rulers and measuring sticks...the feet on your child's own body!

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

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

Preschoolers are fascinated by how colors can be mixed to form new ones. This activity combines color mixing with the concept of melting for extra science fun.

Check out this cool science fair project idea to explore the relation between onions and eyes and how to prevent eyes from tearing while cutting an onion.

Explore properties of liquids and how temperature and salinity effect surface tension of liquids in this fun- filled science fair project idea.

In this science fair project, students will use methylene blue to study the presence of aerobic bacteria in milk.

Why do plants wilt? Kids will learn to think critically about what environmental factors affect plants, and what plants need to survive.

A fun activity for a hot day, this will give young kids a chance to experiment with beginning science and math â and splash around in the process!

Science fair project in which you will examine how crystals are formed by creating your own crystal using charcoal briquettes, salt, and ammonia.

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

In this cool experiment, learn about the forces of resistance in a liquid and race marbles in a cylinder to find out which fluids have a high viscosity.

Why doesn't the ocean freeze? Students answer this question by simulating the chemical composition and temperature of arctic waters in their own home.

This science fair project teaches you about what makes persimmons so tart and how astringency can be removed by studying the effect of tannins on fruit.

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

Invite your second grader to help you measure and mix these fresh, cool concoctions!

Can cells be frozen? This science fair project provides information to answer this question.

This science fair project idea examines the actual cost of three household light bulbs by testing energy consumption.

Learn how starch and carbohydrates interact with different solvents in this fun and easy packing peanut science fair project.

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.

Forget store-bought dyes this Easter: color your Easter eggs with natural dyes made with ingredients from your own kitchen in this 1st grade activity.

This project explores whether music affects the growth and health of plants.

Look for a correlation between temperature and the intensity of cricket chirping. Measure ambient temperature and sound intensity in decibels.