Determine whether butterflies like to drink sugar water, salt water, or plain water.

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?

Science fair project that compares the freezing temperature of salt water and freshwater in order to learn about supercooling and condensation nuclei.

Examine whether distilled water, spring water, or regular tap water yield faster plant growth.

This science fair project idea compares biodiversity between drops of water.

Using an empty tennis ball can and a swimming pool, you will determine if it's possible to have a conversation under water.

Science fair project which determines if plants really do need water to grow, or whether they just need to be kept wet.

Find out which type of sponge holds the most water.

Discover whether a metal will expand under hot water.

This project demonstrates the correspondence between the volume of water displaced by a submerged object and the volume of the object displacing it.

What heats up fasterâwater or soil? 5th grade students test the specific heat of water against the specific heat of sand in this great science fair project.

In this free science fair project, learn how to separate salt from water using heat. A great science project for elementary school kids.

The objective of this science fair project is to analyze the effects of salinity and temperature on water.

This science fair project explores how osmotic pressure forces water through the root up into the plant.

Kids learn about potential energy, and mechanical energy, and how to make power from water with one of our favorite renewable energy projects for kids.

Does putting soapy water on plants help or hinder plant growth? Kids learn about greywater and how it affects plant growth in this cool science fair project.

Students pit the heat capacity of water against the heat capacity of oil while looking at the effects of dipole rotation in this cool science fair project idea.

This science fair project focuses on the use of a conductivity device that will determine if a substance dissolved in water can or cannot conduct electricity.

This science fair project will help students learn about non-vascular plants, such as mosses.

Do you love to make Jell-O? Find out in this science fair project idea if it is possible to make Jell-O with just warm water.

In this science fair project, you'll make a "ghost" appear in a test tube, and learn about what happens when hot water and cold water interact.

In this project, waves of vibrations are experimented with using water in glasses.

In this project students experiment with making music using only glasses of water.

Sink or swim? Calculate the density of various fruits and vegetables using water and a kitchen scale.

Science fair project that determines whether landscaping fabric impacts the ability of plants to receive water.

Science fair project that examines the behavior of water and gravel in creek beds and the formation of sedimentary rocks.

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

Examine which metal conducts more heat by boiling water in 3 pans made of aluminum, copper, and stainless steel.

This science fair project idea studies which kind of rock (sedimentary, igneous, or metamorphic) is most damaged by frozen water.

This science fair project idea explores the relationship between oil and water in terms of density as well as hydrophilic/hydrophobic compounds.