Third Grade Science Experiments (Page 55)

Drinking Water Cleanup

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Do you know where your drinking water is coming from? Sure, it comes out of your faucet, but how does it get there? Drinking water all over the world originates from either surface waters—such as lakes, reservoirs, and rivers—or from underground sources, such as groundwater. But would you want to drink water straight from a river or lake? Probably not; they can be really dirty and muddy! To become clean and safe, this water first has to undergo several treatment processes; the first… Read more

Drone Control with an Analog Joystick

STEM Activity

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How do you steer a drone using a controller with a joystick? Find out in this activity as you program an Arduino to interface with an analog joystick, similar to those found in most video game controllers. You can use the joystick to make a mini popsicle stick drone tilt side to side or move up and down. See this page for a complete list of our mini drone projects. You may wish to do the projects in order. Read more

Effects of Exercise: Changes in Carbon Dioxide Output

Science Fair Project Idea

Scientific Method

You might know that your body needs oxygen to keep going, and that you breathe out carbon dioxide as waste. What happens when you exercise? You have probably noticed that you breathe faster, and your heart beats faster. What triggers your body to respond in this way? How does it "rev up" to keep your muscles going? In this project, you will get a peek into the fascinating science of exercise physiology and find out—with the help of a color changing reaction. Read more

Efficient LED Circuit Design

Science Fair Project Idea

Engineering Design Process

LED lighting can add a cool ambient effect to a room, a device, or even the inside of a car. You may know that LED lights are more efficient than incandescent bulbs, but do you know how to design and build your own LED circuit? How would you minimize power consumption and maximize efficiency? In this project you will learn how to design and build your own LED circuits so you can add LED lighting effects wherever you want. Check out this page for more LED science projects. Read more

Electric Paint: Light Up Your Painting

Science Fair Project Idea

Scientific Method

Electric paint is a fun way to include a circuit with lights in an art project, but it presents a challenge not found in traditional electronic circuits. What happens if you change the length or width of your strokes of paint, such as by painting longer, curvier lines or using a thicker brush? Could this affect the electrical properties of your circuit? Try this project to find out! Read more

Electric Play Dough Project 2: Rig Your Creations With Lots of Lights!

Science Fair Project Idea

Scientific Method

Have you tried our first electric play dough project, and now you are looking for more to do? Do you want to learn more about circuits and add even more lights? Check out this project for part 2 of our play dough circuits series! Read more

Excess Volume: Investigate the "Shrinking Liquids" Effect

Science Fair Project Idea

Scientific Method

Cooking, washing, and many industrial processes involve the mixing of liquids. How liquids behave when they are mixed is dependent on many factors. Sometimes, the mixing behavior of liquids can be quite surprising! For example, when you mix 50 mL of one liquid with 50 mL of another liquid, you might not end up with a 100 mL mixture! In this science project, you will explore this phenomenon, which we call the "excess volume" of mixtures. How do you think your mixing volumes will… Read more

Explore How Chromatography Can Unmix Mixtures

Science Fair Project Idea

Scientific Method

Did you know that mixtures can be unmixed? Chromatography is an analytical technique in chemistry to separate mixtures and identify each of its individual compounds. In this project, you will separate ink dyes found in different markers using a strip of paper, chalk and different liquids. By comparing different chromatography substrates and solvents, you will learn how different attractive forces between substances can affect the separation of a mixture into its individual components. Read more

Explore the “POP” in popcorn

STEM Activity

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Do you like popcorn? It’s not only a tasty snack but also fascinating to watch when it pops in the pot. But why does it do that? What makes the small popcorn kernel jump into the air and change its appearance? Where does the characteristic popping sound come from and does every corn pop? There are many good questions about such a simple snack. Are you curious to find out some answers? In this activity you will do some popcorn science and even get to snack on your experiment. Read more

Exploring DNA Damage: What Effect Do Ultraviolet Rays Have on Yeast Colony Growth?

Science Fair Project Idea

Scientific Method

Though the Sun provides heat and light, which are essential for life on Earth, ultraviolet (UV) rays in sunlight can cause damage to DNA. In this science fair project, you will experiment with a strain of yeast that is super-sensitive to UV light. This project will demonstrate the lethal effects of UV light when DNA damage is not repaired. Read more

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