Kids will learn how to measure the viscosity of liquids by making their own homemade viscometer in this great science fair project idea.

Learn how to make a hygrometer to measure relative humidity in this project. Make a sling psychrometer hygrometer with gauze, thermometers, and a bottle.

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

To help your child learn how to use a thermometer, try this temperature collecting activity at home.

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

Science fair project idea which teaches you how to make butter by separating cream into butter and buttermilk.

How much does 100 weigh? Play this fun guessing game with your child to commemorate the 100th day of school.

This science fair project idea explores whether boiling and freezing water will have an effect on how much it weighs.

Dive into the world of cooking oil and smoke points to discover just how fast some oils start smoking.

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

In this science experiment, observe convection currents forming and learn about how heat energy moves in liquids from hot to cooler areas through convection.

You've heard the expression "burn rubber" but do you know how heat affects rubber? Examine the impact of temperature on rubber in this fun science experiment.

Is horse manure a possible energy source in a crisis? Use calorimetry to find out how much energy horse manure can produce in this science fair project.

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

What is the hydrologic cycle and how does it work? Check out this fun and easy science project where you will model and learn about Earth's water cycle!

Whatever is stacked in your cupboard can be used to help your child learn how to compare fractions and decimals. A great hands-on math lesson!

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.

This fun science project helps to investigate how much water can a plant take up and release in a certain period of time through the process of transpiration.

Introduce your fourth or fifth grader to volume by having him build rectangular prisms, and then count each sugar cube to check his volume calculations.

This hands-on activity gives your child an opportunity to apply various strategies to solve a problem and to check if his answer makes sense.

This fun activity encourages your child to develop their skills in not only taking measurements, but also in working with the measurements themselves.

All you need are pencils, paper and some scissors to get started on this easy and fun game to review astronomy information, or other types of study concepts.

This science fair project idea explores whether mint, known for its âcooling sensationâ really does lower temperatures.

This Pysanky egg-decorating activity is perfect for young artists. Bring a little color and creativity to any holiday with this traditional Ukrainian craft.

The crust is fun for kids to mix and roll out, and the filling overflows with vitamin and anti-oxidant packed berries!

Use familiar household items and decorations to turn estimation into a fun game!

This simple experiment serves as an introduction to the greenhouse effect.

Chlorine and chloramine are added to our tap water to kill harmful microorganisms. What is the best way to filter these disinfectants in your drinking water?

Make this delectable custard, meringue, and graham cracker pie will give your fifth grader practice with measurement and get him interested in the kitchen.

Check out this cool science fair project idea to explore the risk of mechanical deterioration of artifacts placed in a storage box due to mold outbreaks.