High School Science Experiments (Page 9)

A Battery That Makes Cents

Science Fair Project Idea

Scientific Method

Batteries are expensive, but you can make one for exactly 24 cents! In this experiment, you will make your own voltaic pile using pennies and nickels. How many coins in the pile will make the most electricity? Read more

Bottle Rocket Blast Off!

Science Fair Project Idea

Scientific Method

3... 2... 1... 0— blastoff! In this science project, you will use a bottle rocket launcher to launch your own bottle rocket. You will load it with water and pressurized air, make several launches, and find out what makes your rocket soar the highest. Read more

Build a Mini LED Lightsaber

STEM Activity

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137 reviews

Build your own mini LED lightsaber with a straw in this quick Star Wars-themed STEM activity. May the Force be with you! Read more

Build Your Own Crystal Radio

Science Fair Project Idea

Scientific Method

Have you ever wondered how a radio can grab signals that are transmitted through the air and convert them into sound? In this science project, you will build your own AM radio receiver from scratch and use it to listen to AM radio broadcasts. With your crystal radio you will be able to experiment with the circuit and the antenna to get the best reception. Read more

Do-It-Yourself DNA

Science Fair Project Idea

Scientific Method

All living things have DNA inside their cells. How do scientists extract the DNA from cells in order to study it? In this science experiment you can make your own DNA extraction kit from household chemicals and use it to extract DNA from strawberries. Read more

Hydroponics: Gardening Without Soil

Science Fair Project Idea

Scientific Method

What do plants need to grow? Most of us would answer that they need light, air, water, and soil. But by using a process called hydroponics, you can grow plants without soil! How does it work? Try this project and see for yourself! Read more

Build a Circuit to Automatically Water Your Plants

Science Fair Project Idea

Engineering Design Process

Have you ever taken care of a plant? It can be tricky to get it right. You have to remember to water it regularly, and you also have to make sure to give it the right amount of water — not too much or too little. What if technology could help? In this engineering project, you will learn how to automate the entire process of watering a plant. Using a soil moisture sensor and a pump, you will build a circuit that will automatically detect when the soil is too dry, add water, and stop when… Read more

Build and Test a Sun-Tracking Solar Panel

Science Fair Project Idea

Scientific Method

How can you get as much power as possible out of a solar panel, even in the morning or evening when the sun is low in the sky? With a solar tracker system! While many solar panels are fixed in place on rooftops or large ground-mounted poles, a solar tracker system is motorized and lets the solar panels track the sun through the sky during the day. Are these systems worth the added complexity? How much more power do they produce? Try this project and find out! Read more

Make Your Own Harmonica!

STEM Activity

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287 reviews

Can you name the bestselling musical instrument in the world? If you said harmonica, you are right! The harmonica was said to be patented in 1821 by Christian Buschmann, a 16-year-old German boy. Since then, it has become the top-selling instrument in the world and a household item in many places. Luckily, creating beautiful noise is not just an art—it is also a science! In this activity, you will design and explore your own harmonica-like instrument made from household items. Time to… Read more

Build a Wind-Powered Car

STEM Activity

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348 reviews