7th grade science project ideas


Science Fair Project All About Water

Now you can find out what happens to water when it evaporates, condenses, precipitates, and then starts all over again. This project is really the basis of what we all need for survival including humans, plants and animals.

Every human, plant, and animal depends on water for survival. It's controlled by the sun, which produces energy in the form of heat. This heat energy causes the water in the world's oceans, lakes, and even puddles in your backyard to warm and evaporate. When water is heated, it changes from a liquid to a gas. This gas is called water vapor, and the process is called evaporation.

When plants give off water vapor, it's called transpiration. When water evaporates, it rises into the cooler air, collects, and forms clouds. There, the water vapor molecules cool down and change back into liquid water. This is called condensation. As more and more water vapor cools into the clouds, the water droplets that form the clouds become larger and larger. These droplets get so big that the swirling winds in the atmosphere can no longer hold them up.

The droplets fall from the sky. Precipitation is the term for the falling, condensed water molecules, which come down as rain, snow, sleet, or hail--depending on conditions in the atmosphere.

In order to do this science fair project you will need small stones, rubber band or string, plastic soda bottles, soil, string, ice cubes, glass, bowl , plastic wrap, water and a small cup.

Place the small container in the middle of the bowl. Put a small amount of water in the bottom of the bowl. Cover with plastic wrap, secure with the rubber band and put the small stones on top. Place the bowl in a sunny spot so there is heat to make the evaporation begin. Observe how long it takes for condensation to form on the plastic wrap and then drop back into the bowl. Now let us try a more complex system with three large plastic pop bottles. Cut off the top of one and cut off the bottom of another.

Put soil in the neck of the bottle with no bottom, and place a string through the soil with the ends sticking out of the neck of the bottle. Put water and ice in the neck of the third bottle you haven't cut. Place the bottle with soil neck down into the one with no top, extending the straight ends of the string into the bottom bottle.

Place the third bottle neck with ice and water into the one with no bottom. Observe the movement of moisture through the system.

CLICK HERE for complete details on this project.



seventh grade science fair project ideas


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