Middle school science is where students begin to think like real scientists. Instead of just observing, they start asking questions, testing ideas, and analyzing results.
These middle school science experiments are designed for grades 6–8 and cover key topics in chemistry, physics, biology, earth science, and engineering. Each activity uses simple materials but introduces meaningful scientific concepts that help students build a deeper understanding at home or in the classroom.
Many of these activities can be expanded with variables, repeated trials, and data collection to meet middle school science expectations.
What Do Middle Schoolers Learn in Science?
Middle school science focuses on several key areas:
- chemistry (reactions, matter, and change)
- physics (forces, motion, and energy)
- biology (cells, systems, and genetics)
- earth science (weather, cycles, and environmental impact)
- engineering and STEM (problem-solving and design)
These experiments support real scientific thinking by helping students:
- form a hypothesis
- identify variables
- collect and record data
- analyze results
- explain findings using evidence
👉 If you want to dive deeper into the process, explore the scientific method for kids, learn how to write a hypothesis, and practice choosing variables in an experiment.
At a Glance
Field: Chemistry, Physics, Biology, Earth Science, Engineering
Grades: 6–8
Concepts Explored: Scientific method, variables, reactions, energy, systems, cycles
Prep Time: 5–20 minutes
Mess Level: Low to medium
How These Experiments Build Real Science Skills
These activities go beyond simple demonstrations. They help students build the skills needed for science class and science fair projects.
Students can:
- write predictions and hypotheses
- test one variable at a time
- collect measurable data
- create graphs and charts
- draw conclusions based on results
Many of these experiments include printable worksheets that support data collection and analysis.
👉 For support with presenting results, check out how to create a science fair board project. You’ll find more science fair information below.
Lab Safety Tips for Middle School Science
Before starting any experiment, it’s important to practice safe science habits.
Students should:
- wear safety goggles when needed
- handle heat and liquids carefully
- follow instructions step by step
- clean up materials after each activity
👉 Learn more with this full guide to lab safety for kids.
Top 5 Middle School Science Experiments to Try First
Start with these engaging, high-success experiments:
- Red Cabbage pH Indicator (acids and bases)
- Strawberry DNA Extraction (genetics and cells, DNA worksheet)
- Egg Drop Challenge (force and motion)
- Lemon Battery (electricity and circuits)
- Oil Spill Cleanup (environmental science)
Core Middle School Science Topics (With Hands-On Experiments)
🔎 Students can extend these experiment by testing variables and recording quantitative results.
Chemistry Experiments (Reactions, Matter, and Change)
Chemistry helps students understand how substances interact and transform.
- Red Cabbage pH Indicator (acids, bases, chemical indicators)
- Milk Plastic / Casein Polymer (chemical reactions, polymers)
- Homemade Bioplastic (materials science, sustainability)
- Elephant Toothpaste (exothermic reactions, decomposition)
- Carbon Sugar Snake (chemical decomposition, gas production)
- Iodine Starch Test (chemical indicators, food chemistry)
- Separating Mixtures (filtration, evaporation, physical change)
- Phase Change Experiments (states of matter, energy transfer)
- Yeast Fermentation (chemical reactions, gas production)
These activities introduce how matter changes and how reactions produce new substances.
👉 Explore more chemistry experiments for kids to extend this topic.
Physics Experiments (Forces, Energy, and Motion)
Physics explains how objects move and how energy is transferred.
- Egg Drop Challenge (force, motion, impact)
- Crushed Can Experiment (air pressure, temperature change)
- Boyle’s Law Experiment (pressure and volume relationship)
- Cartesian Diver (buoyancy, pressure)
- Convection Heat Spiral (heat transfer, air movement)
- What Colors Absorb Heat Best (energy absorption)
- Macro Refraction Experiment (light, optics)
- Screaming Balloon (circular motion, centripetal force)
- Rising Water Experiment (pressure, gas behavior)
- Friction Experiment (force, motion)
- Sound science experiments for kids (vibrations and waves)
- Light science experiments for kids (reflection and refraction)
- Hot vs Cold Air Experiment (temperature effects, molecular movement)
- Hot and Cold Water Mixing (density, temperature layering)
- Static Electricity / Lightning Experiment (electric charge, attraction, discharge)
These experiments help students visualize abstract physics concepts.
👉 For deeper exploration, check out physics experiments for kids, kinetic vs potential energy experiments, and Newton’s Laws activities.
Electricity and Circuits (Engineering + STEM)
Electricity is one of the most engaging topics for middle school students.
- Lemon Battery (chemical energy to electrical energy)
- Potato Light Bulb (electric circuits, energy conversion)
- Homopolar Motor (magnetism, motion)
- Electromagnet (magnetic fields, electricity)
- Simple Circuit (current flow, closed circuits)
- DIY Flashlight (practical circuit design)
- Circuit Switch (controlling electrical flow)
These activities help students understand how energy flows through systems.
👉 Additionally, look through more circuit project variations here.
Biology Experiments (Cells, Systems, and Life Science)
Biology focuses on how living systems function.
- Strawberry DNA Extraction (DNA structure, cells)
- Banana DNA Extraction (genetics, cell structure)
- Plant Cell Models (cell parts, functions)
- Animal Cell Models (cell parts, functions)
- Potato Osmosis Lab (diffusion, cell transport)
- Dissecting a Flower (plant reproduction, structure)
- Heart Model (circulatory system function)
- Lung Model (respiratory system mechanics)
- DIY Moving Robot Hand (tendons, movement, anatomy)
- Heart Rate Experiment (circulatory system, exercise response)
- Reaction Time Test (nervous system, brain response)
- Digestion in a Bag (digestive system, chemistry)
These experiments connect structure and function in living organisms.
👉 Find more biology activities for kids to continue learning.
👉 Explore the hands-on Anatomy STEAM Pack here.
Microbiology and Decomposition Experiments
Microbiology helps students explore organisms that are too small to see and understand their important role in the environment.
These experiments connect biology, chemistry, and environmental science in meaningful ways.
- Bread Mold Experiment (fungi growth, decomposition, environmental conditions)
- Yeast Fermentation (microorganisms, chemical reactions, gas production)
- Litter Decomposition Study (rates of decomposition, human impact, materials)
- Mini Compost Bin (decomposition systems, nutrient cycling)
- 👉 More Microbiology Projects here
These activities help students understand:
- how fungi and microorganisms grow
- how organic materials break down
- how decomposition supports ecosystems
- how human choices impact waste and the environment
👉 These are excellent connections to environmental science
Observation and Long-Term Science Projects
Not all science happens in one experiment. Some investigations involve observing, recording, and sketching changes over time.
This type of activity helps students:
- carefully observe and draw what they see
- track changes in plants and the environment
- recognize patterns over time
👉 Scientific Illustration and Phenology Study (observation skills, seasonal changes, data tracking)
Earth and Environmental Science Activities
These experiments connect science to real-world environmental systems.
- Oil Spill Cleanup (pollution, environmental impact)
- Stormwater Runoff Model (water systems, pollution movement)
- Ocean Acidification (carbon dioxide, pH changes)
- Acid Rain Experiment (pH changes, climate change)
- Carbon Cycle Model (movement of carbon through systems)
- Nitrogen Cycle Activity (ecosystems, nutrients)
- Melting Ice Experiment (temperature, environmental change)
- Water Pollution Cleanup (environmental impact, pollution)
- Air Filter STEM Challenge (pollution movement, environmental impact)
These activities help students understand environmental challenges.
👉 Explore more Earth science activities for kids and Earth Day activities for kids.
Weather and Climate Science Experiments
Weather is a powerful way to connect science to everyday life.
- Homemade Barometer (air pressure, weather changes)
- Anemometer (wind speed, measurement)
- DIY Weather Station (data collection, observation)
- Insulation Experiment (heat transfer, materials)
- Temperature Investigation (data collection, weather changes, observation)
These are ideal for longer-term investigations and graphing data.
Engineering and STEM Challenges
Engineering activities give students the chance to design, test, and improve real solutions. These projects combine science concepts with hands-on problem-solving and creativity.
- Archimedes Screw (simple machines, water movement)
- Bottle Rocket (force, thrust, engineering design)
- DIY Water Clock (time measurement, flow rate)
- Paper Bridge Challenge (structure, strength)
- DIY Hovercraft (air pressure, friction, motion)
- Walk Through Paper Challenge (geometry, spatial reasoning, problem-solving)
- Renewable Energy Projects (solar, wind, energy transfer, sustainability)
These activities help students:
- test and improve designs
- understand how science applies to real-world problems
- explore how engineers solve challenges using limited materials
👉 Explore more engineering projects for kids for additional design challenges.
Advanced STEM and Thinking Experiments
These activities expand into higher-level thinking and interdisciplinary science.
- Stroop Effect (brain processing, perception)
- Möbius Strip (geometry, topology)
- Citizen Science Projects (data collection, real-world science)
- Real World STEM Challenge Guide (real-world problem solving)
These experiments build critical thinking and observation skills.
Middle School Science Fair Project Ideas
👉 Many of these experiments can be turned into full science fair projects.
Try:
- Potato Osmosis Lab (testing concentration changes)
- Lemon Battery (comparing materials)
- Oil Spill Cleanup (testing cleanup methods)
- Boyle’s Law Experiment (measuring pressure changes)
- What Colors Absorb Heat Best (comparing absorption rates)
- Yeast Fermentation (measuring gas production)
- Paper Airplane Science Fair Lab (aerodynamics)
Make It a Science Project
- Ask a question
- Form a hypothesis
- Test one variable
- Record results
- Analyze and conclude
Extend These Experiments into Full Science Investigations
To go further, students can:
- repeat trials for accuracy
- collect measurable data
- create graphs and charts
- compare results across variables
Middle School Science FAQ
What are the best science experiments for middle school?
Experiments that involve testing variables and collecting data, such as pH testing, osmosis labs, and circuit projects.
What science topics are taught in middle school?
Chemistry, physics, biology, earth science, and engineering concepts.
Can these be used for science fair projects?
Yes, most can be expanded by testing variables and collecting measurable data.
Are these experiments easy to do at home?
Most use simple materials and require minimal setup.
Make Science Fairs Fun!
This printable project pack walks kids step-by-step from idea → experiment → display board, so they understand what they’re doing (not just glue pieces together).
