Third Grade Science Experiments (Page 140)

Breath of Life: Does Exercise Increase Vital Capacity?

Science Fair Project Idea

Scientific Method

How much air do you think you breathe in when you take a deep breath? Can you increase your lung capacity by exercising regularly? Do athletes have greater lung capacity than non-athletes? This project shows you how you can find out. Read more

Bridge Science: Weekly Science Project Idea and Home Science Activity Spotlight

Blog Post

In this week's spotlight: an civil engineering project that lets students and families experiment with bridge design. You may be familiar with famous suspension bridges like the Golden Gate Bridge in San Francisco, but how does a suspension bridge really work? How do the cables work to support the weight on the bridge? Can a suspension bridge carry a greater load than a beam bridge? With common household materials, you can put your own straw-based bridges to the test. How many pennies can… Read more

Bristlebot Shape and Motion Tracking

Science Fair Project Idea

Scientific Method

Bristlebots are tiny little robots with no "brain." They are powered by vibrations and move around randomly. Even if there is no brain, can you still influence how they move by changing their design? Find out in this fun robotics project! Read more

Bubbly Soda Science: Weekly Science Activity

Blog Post

Making your own carbonated beverage can be a lot of fun. How much fizz do you like? What flavor? How sweet? The process of carbonating water and serving up a custom beverage is easier than ever before thanks to commonly available household devices like Sodastream®. But a pressurized approach to creating a carbonated beverage is not the only way to prepare a refreshing soda-style drink. With a few simple ingredients, students can experiment with mixing up their own… Read more

Bug and Insect STEM Roundup

Blog Post

Hands-on STEM projects for K-12 students that want to get hands-on with insects, worms, and other species in the backyard. Take advantage of warmer weather and time outside for bug, worm, or flying insect science this summer with your kids. Bug, Insect, and Nature-focused Projects for Students Are There Bugs Under Your Feet? Ask a Cricket, 'What is The Temperature?' Bug Vacuums: Sucking up Biodiversity Will Different-colored Lights Affect… Read more

Build a Bathtub Toy Raft Powered by Surface Tension

STEM Activity

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Have you ever wondered why a water strider can walk on water? Or how detergent can clean your dishes? If you look around you carefully, you can find dozens of similarly interesting phenomena that are all linked to the surface tension of water. In this science activity, you will make a little toy raft that is actually powered by surface tension, and use your vessel to investigate how surface tension works! Read more

Build a Color-Detecting Rover

Science Fair Project Idea

Engineering Design Process

The Mars Curiosity and Perseverance rovers use scientific instruments, nicknamed ChemCam (Figure 1) and SuperCam respectively, to help them analyze the composition of rocks and soil on Mars. You can learn more about these cameras from the resources in the Bibliography, and more about why scientists want to analyze rocks on Mars from the video on this page. Figure 1. The two main parts of the ChemCam instrument on the Mars Curiosity rover. For a science… Read more

Build a Disk Siren

STEM Activity

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If you live in an urban area, you probably hear them almost every day: sirens. Police cars, ambulances, fire trucks—they all can come blaring. Their wailing sounds are piercingly loud to help alert others to clear the road in front of them. But have you ever thought about how this loud noise is generated? Make your own disk siren in this activity and find out for yourself. Read more

Build a Light-Up Activity Timer

Science Fair Project Idea

Engineering Design Process

Do you have trouble remembering when to stop playing and clean up? Have you ever had little kids throw a tantrum about cleaning up while you were babysitting? If so, this project is for you! You will convert a stuffed animal into a light-up activity timer. You can use the timer for different activities like play, exercise, or doing homework. What you use it for is up to you! Read more

Build a Water Sprinkler Toy

STEM Activity

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Do you enjoy playing with water? Have you ever considered building a water sprinkler toy? It is easier than it looks! Get some PVC pipes, a few connectors, and a backyard water hose, then drill a few holes and start connecting! What will be your most creative and most fun design? Read more

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