Fourth Grade Science Experiments (Page 20)

Science Fair Project Idea

Scientific Method

How can seawater from the oceans be turned into fresh water that is suitable for people to drink? Through a process called solar desalination! In this science project, you will make a solar desalination apparatus using readily available materials, and a power source that is free. How much water can the device produce, and is it still salty at all? What factors affect how effectively saltwater is turned into fresh water? Read more

The Dynamics of a Bouncing Ball

Science Fair Project Idea

Scientific Method

Many sports use a ball in some way or another. We throw them, dribble them, hit them, kick them, and they always bounce back! What makes a ball so bouncy? In this experiment you can investigate the effect of air pressure on ball bouncing. Read more

What's The Best Way to Land a Model Rocket?

Science Fair Project Idea

Scientific Method

What's the best way to land a model rocket? What makes the rocket hit the ground safely at a low speed? What prevents the rocket from drifting too far if it's windy? In this project, you will make your own rockets from paper towel tubes and drop them to test different recovery methods like parachutes and streamers. What method do you think will work the best? Read more

10 STEM Activities with Cardboard Tubes

Blog Post

Don't throw those out! Save all the empty cardboard tubes! These simple materials can be put to use in fun hands-on science and engineering activities. This roundup highlights 10 free STEM activities you can do with empty cardboard tubes from toilet paper or paper towel tubes. Recycled materials are great for many hands-on science and engineering activities. Paired with craft materials and some tape or glue, kids can turn recycled containers and… Read more

Build an Archimedes Screw

STEM Activity

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The Archimedes screw is an ancient device used to lift water from one location to another. They are so useful that they are still in widespread use today! After a quick trip to the hardware store, you can build your own Archimedes screw in this fun activity. Read more

Crazy Crystal Creations: How to Grow the Best and the Largest Crystals

Science Fair Project Idea

Scientific Method

Crystals come in all different shapes and sizes. However, the purest and cleanest crystals are usually also the ones that grow to be the largest in size. In this science fair project, you will compare the size and shape of crystals grown in three different temperature conditions: room temperature, in the refrigerator, and in an ice bath. With just water and borax, a household cleaning product, you can discover the best recrystallization method for growing large, pure crystals. Read more

Create and Test Your Own Hydrogel Face Mask Recipe!

Science Fair Project Idea

Engineering Design Process

Have you ever tried a beauty face mask? Cosmetic face masks are skin care products that promise rapid hydration of your skin to make it look younger and more radiant. Hydrogel face masks are made of jelly-like materials that are infused with special ingredients to nurture your skin. The ingredients for cosmetic products like face masks are carefully selected by cosmetics chemists. Each product is designed to have the properties that are necessary for its intended purpose. In this science… Read more

How Big Are the Planets in Our Solar System?

STEM Activity

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Did you know that there are more planets than stars in our galaxy? All of these planets circle around a star, but only eight of them—Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune—circle around the Sun—the star in our solar system. This activity explores the relative size of these eight planets. Is one bigger than the others, or are they all about the same size? Read more

How Does Dust Affect Solar Panel Power Output?

Science Fair Project Idea

Scientific Method

Scientists can use solar power to provide electricity on the Moon or Mars, but there is one big problem—dust! How does dust cover impact the power output of a solar panel? How could scientists and astronauts mitigate this problem to keep the solar panels producing at their maximum output? Try this science project yourself and find out! Read more

Hydroponics Made Easy

STEM Activity

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Do you think plants can grow without soil? If you've tried growing vegetables, you probably planted the seeds or seedlings in soil. Soil gives the plants the nutrients they need to grow. However, plants can grow without soil, too, using a process called hydroponics. In this activity, you will transform a bottle into a mini-garden that needs only light, air, and nutrient-rich water to grow! Read more

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