7th grade science fair projects

30 Must-Try 7th Grade Science Fair Projects for Curious Minds

Dive into the world of scientific discovery with these 30 intriguing 7th grade science fair projects. Each project offers a hands-on experience, making learning both fun and engaging for young minds.

7th Grade Science Fair Project Ideas

Embarking on a 7th grade science fair project is an adventure into the world of discovery and innovation. These project ideas are designed to ignite curiosity and deepen understanding in young scientists, covering a range of exciting topics from physics and chemistry to biology.

1. The Saltwater Density Experiment

Saltwater Density

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This project investigates how the boiling point of water changes with the addition of different amounts of salt. Students will boil water with varying amounts of salt, such as 0g, 5g, and 10g, and record the temperature at which the water starts to boil for each amount. Through this experiment, students learn about the concept of boiling point elevation and how solutes like salt influence the physical properties of solvents.

2. DIY Atmospheric Pressure Barometer

Atmospheric Pressure

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In this project, students create a simple barometer using everyday materials like a balloon, a jar, and a straw to observe changes in atmospheric pressure. They’ll record the barometer’s readings over a period and correlate these with weather changes, thereby learning about atmospheric pressure and its relationship with weather patterns.

3. Sun-Powered Water Purifier

Water Purifier

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Students demonstrate how solar energy can purify water by constructing a solar distillation device using materials like plastic bottles, black paper, and clear plastic wrap. They test the device’s effectiveness in purifying dirty water, gaining insights into renewable energy applications and the distillation process.

4. Constructing a Simple Electric Motor

Electric Motor

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This project involves building a basic electric motor to understand the principles of electromagnetism. Students use a battery, magnets, wire, and a screw, experimenting with different configurations to optimize the motor’s performance. This project helps them explore the fundamentals of electromagnetism, electric circuits, and motor design.

5. Plant Growth under Colored Lights

Plant Growth

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In this experiment, students grow identical plants under various colored lights, such as red, blue, and white, and observe the differences in growth patterns over several weeks. This project helps them understand how different light wavelengths affect photosynthesis and plant growth.

6. Natural pH Indicator Project

pH Indicator

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Students extract a pH indicator from red cabbage and use it to test the acidity or alkalinity of various household liquids, such as vinegar, baking soda solution, soap, and lemon juice. This project teaches them about pH levels, acids, bases, and the application of natural substances in scientific testing.

7. Musical Influence on Plants

Musical Influence

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This project explores the impact of different types of music or sound frequencies on plant growth. Students will play various genres of music near growing plants and monitor their growth over a few weeks. This experiment aims to understand if and how sound waves influence biological growth processes in plants.

8. Homemade Seismograph


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Students get to construct a simple seismograph, a device used to detect and record earthquakes. Using readily available materials like a hanging weight, a pen, and a rolling paper cylinder, they can simulate how professional seismic equipment works. This project helps them learn about seismic waves, earthquake detection, and the science behind seismology.

9. Sugar Content Analysis in Drinks

Sugar Content Analysis

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This project involves measuring the sugar content in various beverages. Students can create a homemade refractometer or use other methods to quantify sugar levels in different drinks, such as sodas, juices, and sports drinks. The aim is to understand nutritional science and raise awareness about sugar consumption.

10. Efficient Wind Turbine Design

Wind Turbine

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In this experiment, students will design and construct small wind turbines and test how different blade designs affect their efficiency in generating power. Using materials like cardboard, plastic, and a small motor, they’ll explore concepts of renewable energy, aerodynamics, and engineering design.

11. Exploring Magnetism and Distance


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This project allows students to investigate how the strength of a magnetic field changes with distance. They will use magnets of various sizes and a measuring device like a compass or iron filings to observe the magnetic field’s reach and strength. This experiment teaches them about magnetic fields, the inverse-square law, and basic principles of physics.

12. Testing Insulation Materials

Insulation Materials

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Students will test the effectiveness of various materials as insulators. They can use items like foam, fabric, paper, and plastic to insulate a container holding a warm substance (like water) and measure how effectively each material retains heat over time. This project helps students understand thermal conductivity, energy conservation, and practical applications in building and product design.

13. DIY Hovercraft Project

Hovercraft Project

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In this hands-on project, students build a hovercraft using simple materials like a CD, a balloon, and a bottle cap. They explore the principles of air pressure and friction by making the hovercraft glide over different surfaces. This project introduces concepts in physics and engineering, demonstrating how air pressure can be used to reduce friction.

14. Salt Crystal Formation Patterns

Salt Crystal

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Students grow crystals using different types of salts (like table salt, Epsom salt, and rock salt) and compare their structures, sizes, and growth rates. They learn about the crystallization process, the properties of different salts, and how crystal structures form in nature.

15. Egg Drop Protection Experiment

Egg Drop

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This experiment challenges students to design a device that can protect an egg from a high fall. Using materials like straws, bubble wrap, and cardboard, students apply concepts of physics, particularly force and impact, to create a protective mechanism. This project enhances problem-solving skills and understanding of physics principles.

16. Baking Soda and Vinegar Rocket

Baking Soda and Vinegar Rocket

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Students construct a simple rocket and explore the chemical reaction between baking soda and vinegar as a propulsion method. They can experiment with different amounts of reactants and rocket designs to achieve the best launch. This project teaches chemical reaction basics and the principles of propulsion.

17. Natural Water Filtration System

Natural Water Filtration

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In this environmental science project, students build a water filtration system using natural materials like sand, gravel, and activated charcoal. They test the system’s effectiveness in filtering impurities from dirty water, learning about water purification methods, environmental conservation, and the importance of clean water resources.

18. Comparing the Strength of Different Geometric Structures

Geometric Structures

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In this project, students will construct models of different geometric shapes such as cubes, pyramids, and spheres using materials like straws, toothpicks, or popsicle sticks. They will then test the strength of these structures by applying weight or force until they collapse. This experiment helps students understand the principles of engineering and architecture, and why certain shapes are used in construction for their strength and stability.

19. Exploring the Properties of Non-Newtonian Fluids

Non-Newtonian Fluids

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Students will create non-Newtonian fluids, such as a cornstarch and water mixture, and study their unique properties. They can experiment with applying different forces to the fluid and observe how it behaves differently under various conditions. This project introduces students to complex fluid dynamics in an accessible and fun way.

20. Solar System Scale Model

Solar System Scale

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In this astronomy project, students create a scale model of the solar system, demonstrating the relative sizes and distances of the planets from the sun. Using materials like balls of different sizes, string, and measurements, they can visually represent the vastness of space and the position of planets. This project helps students grasp astronomical distances and the structure of our solar system.

21. Studying the Effect of Acid Rain on Plants

Acid Rain

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This environmental science project allows students to understand the impact of acid rain on plant life. They will simulate acid rain using diluted vinegar and water, then apply it to different plants, observing changes in growth, leaf color, and overall health. This experiment educates students on environmental pollution, its effects on ecosystems, and the importance of environmental protection.

22. The Greenhouse Effect Model

Greenhouse Effect

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Students can build a model to demonstrate the greenhouse effect using simple materials like plastic bottles, thermometers, and lamps. They will compare temperature changes inside bottles with different coverings, representing the Earth’s atmosphere with and without greenhouse gases. This project provides insight into environmental science, climate change, and the impact of human activities on global warming.

23. Creating a Model of the Digestive System

Digestive System

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This biology-based project involves creating a working model of the human digestive system to understand how food is processed and nutrients are absorbed. Using household items and craft materials, students can simulate different parts of the digestive tract and demonstrate the digestion process. This project teaches about human biology, the importance of nutrition, and how the body processes food.

24. Homemade Lava Lamp

Lava Lamp

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By creating a lava lamp, students will observe the interaction between oil and water, two liquids with different densities, and how Alka-Seltzer creates a bubbly reaction, causing the colored water to move through the oil. This project is not only visually appealing but also teaches important chemistry concepts about density, solubility, and chemical reactions in an easy-to-understand and engaging way.

25. Building a Simple Weather Station

Weather Station

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Students will learn how to record and interpret meteorological data by building instruments like an anemometer for wind speed, a rain gauge for precipitation, and a thermometer for temperature. This project helps them understand weather patterns and climate changes, fostering an interest in environmental science and climatology.

26. Understanding the Physics of Parachutes


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By experimenting with different parachute designs, students will delve into the study of forces, air resistance, and gravity. They will understand how surface area and material choice affect the performance of parachutes, gaining insights into basic principles of physics and the practical applications in areas like aeronautics and safety engineering.

27. Understanding Sound Waves with a DIY Guitar

DIY Guitar

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Build a simple guitar to explore how sound is produced through string vibrations. They learn how changing string tension and thickness affects pitch, offering a hands-on experience in the physics of sound and the basics of musical instrument design.

28. Exploring Pendulum Physics


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Students will build simple pendulums and experiment with variables like length, weight, and angle to understand how these factors affect the pendulum’s period. This project introduces concepts of simple harmonic motion and the relationship between pendulum properties and their oscillation period.

29. The Chemistry of Rusting


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Explore the oxidation process where iron reacts with oxygen and water to form rust. Students experiment with factors like saltwater to see how they influence rusting, learning about material science, corrosion prevention, and its practical implications on infrastructure and everyday objects.

30. Chemical Reactions with Homemade Volcano

Homemade Volcano

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Create an acid-base reaction using baking soda and vinegar to simulate a volcanic eruption. This experiment not only demonstrates the exciting reaction when an acid meets a base but also introduces students to the basics of geological volcanic activities. It’s an engaging way to learn about chemical reactions and earth science.


In conclusion, these science fair projects offer 7th graders an exciting journey into the realms of physics, chemistry, and biology. From understanding sound waves with a homemade guitar to exploring the mysteries of saltwater density, each project combines hands-on experimentation with key scientific principles. These experiments are not just educational, but also spark curiosity and innovation, encouraging young minds to explore, question, and understand the fascinating world of science around them.

AboutCorinne Switzer

Corinne is an avid reader and takes a keen interest in conspiracy theories. When not busy with her day job, she likes to indulge the writer in her and pens columns on a wide range of topics that cover everything from entertainment, healthy living to healthcare and more.