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.

This science fair project idea researches how your choice of clothing affect how hot or cool you feel during the day.

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

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.

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

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?

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

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!

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

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.

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.

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.

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.

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!

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

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

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

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.

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

The project investigates the affect music has on plant growth while experimenting with rock, classical and no music.

Compare animal and plant fats and observe, and record, and draw conclusions about their similarities and differences.

This science fair project idea identifies clouds as a means of predicting the weather.

Kids will learn about insulation, heat conduction, and the economic benefits of energy efficient windows in this cool science fair project.

This science fair project idea explores whether factors such as temperature and concentration affect the pH of a solution.