Fourth Grade Science Experiments (Page 146)

The Buoyancy of Balloons

Science Fair Project Idea

Scientific Method

Balloons are a festive addition to many celebrations. You've probably noticed, though, that over a short period of time, helium-filled latex balloons start to lose their buoyancy. So when you're planning your next party, how soon can you buy the balloons in advance before they start deflating? In this science fair project, you will use a simple scale to measure the lift supplied by a set of balloons, and determine the rate of lift decay. Read more

The Business of Fizziness: Test Your Soda Fizz!

STEM Activity

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12 reviews

You’ve probably seen the reaction that happens when you add Mentos candy to a diet soda. The resulting eruption is powerful enough to be dangerous, and is the source of many online videos! While many people are familiar with this reaction, few of them understand why it takes place. The Mentos + Soda reaction is not actually a chemical one, but a physical one called ‘nucleation’. In this activity we will explore nucleation in soda at a smaller scale by adding some unusual… Read more

The Cannon Fungus: Grow a Fungus That Fires Objects at Light Sources!

Science Fair Project Idea

Scientific Method

The Pilobolus fungus has an interesting way of making sure the next generation has a good start on life. At high speed, the fungus shoots a sac that contains spores toward a light source. Why toward a light source? Because that is where it is most likely to find an open area with grass. Once the spore is placed on grass, it is eaten by a cow or a horse, which is a critical step in its life cycle. The spore passes through the animal's digestive track and ends up in a pile of manure. For a fungal… Read more

The Case of Mistaken Identity

Science Fair Project Idea

Scientific Method

Mysteries and detective stories have been popular since the time of Sherlock Holmes. The solutions to these fictional cases often involve untangling seemingly contradictory evidence from eyewitnesses. This project studies one procedure used in the real-world process of eyewitness identification of criminal suspects: the lineup. How accurate are eyewitness identifications using various lineup methods? Read more

The Chills and Thrills of Roller-Coaster Hills

Science Fair Project Idea

Scientific Method

Think it's a good idea to stream music, watch videos, or check social media while doing homework? Are you a thrill-seeker? Well, this is the science fair project for you! What makes a ride so thrilling that people want to ride it over and over again even though it scares them? Is it the speed, the twists and turns, the vertical drops? In this science fair project, you will build and use an accelerometer to figure out what makes a roller-coaster ride worth standing in line for. Oh, and if Mom… Read more

The Curdling Properties of Different Milks: How to Avoid Little Miss Muffet's Curds

Science Fair Project Idea

Scientific Method

Has a milk-based soup, sauce, or gravy ever curdled on you (formed lumps) as you were preparing it? Curdling is the process of coagulation that occurs where the proteins in the milk clump together. Sometimes curdling is desirable—for example, if you want to make a delicious cheese or yogurt—but if you are trying to make a milk-based soup or gratin, or if you're adding milk to a hot drink, curdling is very unwanted because you lose the smooth, creamy texture. Nobody likes clumps and… Read more

The Effects of Card Counting on a Simple Card Game

Science Fair Project Idea

Scientific Method

Do you like to play cards? Here's a project that will get you thinking about strategy in card games and help you become a better card player. Read more

The Fluffiest Muffins: Flour Type and Muffin Density

Science Fair Project Idea

Scientific Method

Here's a project idea for all of you bakers out there. What happens if you try your favorite muffin recipe with different types of flour (e.g., white, whole wheat, rye, soy, etc.)? Think of ways you can measure the results. How would you measure the density of a muffin? A kitchen scale would definitely be useful for this project, both for measuring the results and for portioning out the batter for equal-sized muffins. What other measures might be of interest? (Nakajima, 2005) Read more

The Golden Rules of Photography

Science Fair Project Idea

Scientific Method

What is it that famous photographers do to make their images so pleasing to the eye? Find out if simple rules of geometry can make you a better photographer. Read more

The Importance of Making Sure a Drug's Aim Is True

Science Fair Project Idea

Scientific Method

Scientists recently found that some small drugs can stop infection by the deadly Ebola virus in its tracks. Lab researchers found that these drugs bind to a protein that the Ebola virus uses to enter our cells, and this is how infection is prevented. However, this also means that the bound protein no longer functions in our cells. How might these drugs accidentally disrupt important biological processes in our bodies? What other proteins might these drugs bind to? In this science project,… Read more

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