This science fair project on testing water hardness is a great introduction to practical chemistry. Test and learn the difference between hard and soft water.

This science fair project idea investigates how the height at which a pendulum is released affects the length of time it continues.

Science fair project that uses distillation to convert salt water into fresh water.

Check out this fun science fair project idea to explore fun facts about fruit juices and learn why do juices turn bad in the fridge.

This science fair project idea discovers whether there are some objects that do not fall at a constant rate.

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

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

Science fair project that determines what percentage of air is made up of oxygen by examining the chemical reaction between oxygen and rust.

Science fair project that demonstrates the principle of conservation of mass by conducting a chemical reaction inside a sealed Ziploc bag.

Teach kids about a fun way they can remember this more efficiently- the power of mnemonics. Kids will be amazed.

Kids will learn how to make a steam powered rocket boat, also called a putt putt boat or a pop pop boat, in this great science fair project for 4th graders.

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

Check out this fun science fair project idea to determine if the size of a particle affect the rate or speed of a chemical reaction.

Science fair project that helps you create your own compost pile in order to test the efficiency of different methods of composting.

Be a chemist for a day and study the simple reaction between sugar and heat. Try heating sugar and see what happens!

In this science project, learn about water transport in plants and make a beautiful dyed floral arrangement with cohesion, adhesion, and xylem tubes!

In this fun science fair project idea, kids will experiment with various methods in order to discover the fastest way to cool a soda.

Find the North Star, and measure your latitude! The purpose of this science fair project is to find latitude and learn about geographic locations.

Kids construct a single fixed pulley system to learn how pulleys can make work easier in this cool physics and engineering science fair project idea.

Learn about endothermic and exothermic reactions and energy exchange by experimenting with temperature change in chemical reactions.

In this free science fair project, build a star clock and learn how to tell time on a clear night by observing the big dipper!

Determine whether carpet placed on a lawn will kill grass and weeds. Choose an area of lawn that you would like to remove, record grass that is dead or dying.

This project examines the concentration of dissolved oxygen in water, with and without oil.

This science fair project idea builds models of various types of bridges and then determines which bridge design is the strongest.

Kids build a desert food chain, desert food web, and desert food pyramid in this cool science fair project to learn about trophic levels and consumers.

Do hand soaps and sanitizers prevent the growth of bread mold? If so, why? Kids will find out with this fun and informative science fair project idea.

Saturn is the ringed planet in our solar system, a gas giant with rings made of ice and dust. Let's make a cool scale model with an old CD and some glitter!

This science project examines the effectiveness of various types of laundry detergents on stains trapped on a white handkerchief.

Use a microscope in this experiment to learn about different kinds of "good bacteria" that turn milk into yogurt!

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.