Third Grade Science Experiments (Page 43)

Delayed Release Pill Challenge: Getting Medicine to the Right Place at the Right Time

Science Fair Project Idea

Engineering Design Process

A lot of medication comes in the form of pills that you need to swallow. But not all pills are the same! Some look like little capsules, others are made of pressed powder. Why are there different types of pills? Different types of pills release their active ingredients in different ways. Some release their active ingredient right after initial administration. Others release their active ingredient much later. Such drugs are called delayed-release drugs. These kinds of pills have to be… Read more

Develop Your Own Soda Pop Recipe

Science Fair Project Idea

Scientific Method

Carbonated bevarages are quite popular in the United States (despite the health risks of drinking too much of the sugary ones). Many people love their bubbly, fizzy flavors. But how do the bubbles, fizz, and taste get into the water? In this cooking and food science project, you will work with baking soda, citric acid, and sweetener to create a your own soda pop. Once you develop your recipe, try it out on your friends and family. Who knows? You might create the next soda pop sensation! Read more

DNA Fingerprinting

Science Fair Project Idea

Scientific Method

Are you interested in the technical and ethical aspects of genetic screening, forensic science, and DNA fingerprinting? Scientists use different forms of a gene, called alleles, to differentiate between two fingerprints. One such sequence used in human DNA fingerprinting is the Alu repeat (a 300 base pair repetitive sequence of DNA) on chromosome 16. During evolutionary time, up to 1 million copies of the Alu repeat have become randomly inserted throughout the human genome. Within a specific… Read more

Drug Solubility

Science Fair Project Idea

Scientific Method

When you take medicine, it needs to dissolve in order to be passed into your bloodstream to have an effect. On the other hand, the drug needs to be packed into a small, dense pill to make it easier to swallow. How does the delivery method of a drug change how quickly it enters the bloodstream? Compare different brands of a drug to find out which brands dissolve the quickest. Does the pH of the stomach (which is usually between 1 and 2) matter? Compare coated to uncoated pills: does the coating… 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

Harvesting Fresh Water With a Fog Catcher

Science Fair Project Idea

Scientific Method

Did you know that about 1 in 10 people worldwide do not have access to clean water? Collectively, girls and women worldwide spend an average of 200 million hours every day collecting the water they need from rivers, water holes, or lakes. What if there was a way to capture water from another source—like the air? In areas where there is a lot of fog, a device called a fog catcher makes this possible. Fog catchers use fine meshes to capture and collect water droplets from the foggy air.… Read more

How Bright Is Your Glow Stick? Measure It!

Science Fair Project Idea

Scientific Method

Objects that glow in the dark hold a special place in the imagination of both children and adults. The lights go out at night, but these odd things refuse to disappear. Where does the light come from? Do they work in any climate? In this science fair project, you will make a very simple electronic device to measure the light given off by luminescent materials. The device will be used to study how temperature affects luminescence. Read more

How Does the Intensity of Light Change with Distance?

Science Fair Project Idea

Scientific Method

How does the intensity of a light source change as you move away from it? This project describes a method to verify the inverse square law: how light, sound, electrical signals, and gravity each decrease with distance from their source. It does not matter if you are talking about a lightbulb or the sun; this law still applies! Read more

How Electricity Changes pH in Salt Solutions

Science Fair Project Idea

Scientific Method

You have probably heard the saying that "water and electricity don't mix." Well, in this chemistry science fair project you will mix them, to create two solutions, one basic and one acidic. The apparatus is very simple, but the chemistry is complex and offers many avenues for exploration. Read more

How Much Sugar Is Really in That Soda?

Science Fair Project Idea

Scientific Method

You know there is sugar in non-diet soda, but just how much sugar? Sure, you can look on the ingredients label, but how do food scientists actually measure the amount of sugar in a solution? They use a simple scientific device called a hydrometer. The hydrometer floats in the solution that is being tested, and the higher it floats, the more sugar there is! In this science fair project, you will use a precision hydrometer to measure the amount of sugar in soda. Read more

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