Twelfth Grade Science Experiments (Page 132)

How Can Life Survive on a Planet with Extreme Tidal Locking?

Science Fair Project Idea

Scientific Method

Have you ever wondered what life might look like on other planets? Life might need to survive conditions that would seem very extreme to us. Such conditions likely exist on planets that orbit abundant red dwarf stars. These planets can undergo tidal locking, which means one side is a perpetual, freezing night and the other is a perpetual, scorching day! How does life stand a chance? In this science project, you will test what extreme temperatures microscopic life can survive to model some of… Read more

How Can Your Faucet Save Water?

Science Fair Project Idea

Scientific Method

One way to save water is to turn the faucet off while you brush your teeth. But did you know that there are products that can help save water even while the water is on? In this experiment find out how low-flow faucets and aerators work to reduce the flow of water. How much water can you save? Read more

How Direct Reprogramming Can Transform One Type of Cell Straight into Another

Science Fair Project Idea

Scientific Method

In the first decade of the 21st century, scientists found ways to make one adult cell type turn into a completely different cell type. This has huge implications for the medical field, including being able to take some cells that a person could spare, such as skin cells or blood cells, and turn them into another cell type that might be much more important for that person to have, such as cells to make a new kidney. How are scientists able to accomplish this amazing feat of "reprogramming" the… Read more

How Do Food Preservatives Affect the Growth of Microorganisms?

Science Fair Project Idea

Scientific Method

This project uses liquid cultures and agar plates to investigate the effects of different concentrations of a food preservative on microbial growth. Read more

How Do the Seasons Change in Each Hemisphere?

Science Fair Project Idea

Scientific Method

On a rainy day, do you ever wonder what the weather is like on the other side of the planet? Different regions around the globe can have very different seasonal weather patterns. In this experiment, you can test if these seasonal variations are related to which hemisphere each region is located in. Read more

How Do Under-Inflated Tires Affect the Difficulty of Riding a Bike?

Science Fair Project Idea

Scientific Method

If you ride a bike, you probably know that you have to occasionally pump up the tires to keep them fully inflated. Over a long period of time, the tires slowly leak air, so their pressure will decrease. Have you ever noticed that it is actually harder to ride a bike when the tire pressure is too low? This is because the tires are a big factor in the rolling resistance of the bike. In this sports science project, you will measure how tire pressure affects the force required to move a bike. How… Read more

How Do You Know Where You Are Without GPS? Dead Reckoning and Inertial Navigation

Science Fair Project Idea

Engineering Design Process

Put a meter stick on the ground. Starting at one end of the stick, close your eyes and try to walk exactly one meter. Open your eyes. How close were you? Now try it again with five, ten, or twenty meters. Does it get harder as the distance gets bigger? Without an outside reference from your visual system, it's quite difficult to know exactly how far you've gone! Electronic navigation systems face the same problem. Without an external reference like the global positioning system (GPS), it's very… Read more

How Do You Take Your Tea? Make a Simple Electronic Device to Measure the Strength of Tea

Science Fair Project Idea

Scientific Method

A nice hot cup of tea sure can wake and warm you up in the morning. In this project, you will investigate the chemistry of tea. The longer you steep a tea bag in hot water, the stronger the tea will be. But how does the strength of the tea change with longer brewing time? In this project you will make a very simple electronic device to measure the strength of tea. The device will determine how strong the tea is by measuring the amount of light the tea absorbs. Read more

How Does a Chick Breathe Inside Its Shell?

STEM Activity

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Have you ever wondered how an unborn chick breathes inside its shell? Every animal needs oxygen to live, so the chick must get air somehow! When an animal—including a human—inhales, oxygen enters its lungs and is then distributed to all the different parts of its body. The animal's metabolism converts the oxygen into energy. During this process, a waste gas called carbon dioxide is produced. To get rid of it, the carbon dioxide is carried back to the lungs, where it is collected… Read more

How Does LED Brightness Vary with Current?

Science Fair Project Idea

Scientific Method

LEDs (light-emitting diodes) are electronic components that convert a portion of the electrical energy flowing through them into light. How does the intensity of the light produced vary with the current flowing through the LED? To find out, you'll build some simple circuits to vary the current flowing an LED. You'll also build a simple light-to-voltage converter circuit to measure LED output. Read more

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