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Science Fair Ideas

Here are some ideas for a science fair project:

Life Science

First/Second Grade Ideas

  • What is the best way to keep cut flowers fresh the longest?
  • Can plants grow in pots if they are sideways or upside-down?
  • What type of food allow mold to grow the fastest?
  • What type of soil is the best for growing beans?
  • What is the best way to ripen an avocado?
  • Can plants grow without sunlight?
  • What attracts fruit flies?
  • Why do greens turn brown? (i.e. salad)
  • How do smells affect cricket behavior?
  • Can you make a mummy out of a hot dog?
  • Does storing cucumbers and tomatoes in the fridge affect their flavor?
  • Does placing a boiled egg in the fridge make it easier to peel?
  • Does hair color affect static electricity?
  • How does exercise change body temperature?

Third/Fourth Grade Ideas

  • Does music have an affect on animal behavior?
  • Does music have an affect on plant growth?
  • Does age affect human reaction times?
  • Does the color of birdseed affect how much the birds will eat it?
  • How does smell affect taste?
  • How do different pencils affect writing fatigue?
  • What is the best way to reduce odor from shoes?
  • How do you store bread safely?
  • What type of bean germinates fastest?
  • Does a dog prefer homemade dog food?
  • What is the effect of caffeine on heart rate?
  • How do seeds hitchhike?
  • Does a microwave effect the seeds germination?
  • Which parent affects fingerprint patterns more?
  • Do students perform better if they eat breakfast?
  • Can you tell the difference between various soft drinks without using your sense of smell? 
  • How can I prove that some foods contain more fat than others?
  • Do boys and girls have the same lung capacity?
  • Are most people visual or auditory learners?
  • How many numbers can most people remember?




Earth Science

First/Second Grade Ideas

  • What type of soil can hold the most liquid?
  • Why doesn't sea water freeze like fresh water?
  • What type of sand makes the best sandcastle?
  • What factors grow the best sugar crystals?
  • How are clouds formed?
  • What can be done with all that trash?
  • Can rocks can float?
  • Can you make energy from garbage?
  • Why does the moon glow?
  • Does air have mass or weight?
  • How can you prevent rust from forming?
  • How does moisture affect the color of soil?

Third/Fourth Grade Ideas
  • What can you do to stop erosion? What is erosion?
  • How do fins on a rocket affect its flight?
  • What conditions produce craters?
  • How does frost form?
  • What does a barometer do? Make your own barometer.
  • How do you make your own fossil?
  • What causes a tsunami?
  • What affects evaporation the most? air temp, water temp, or wind speed?
  • What are some environmental effects of biodegradable and non-biodegradable bags?
  • What causes a mirage?
  • How can you make safe drinking water?
  • Which soil do earthworms like best?
  • Are igneous, sedimentary, or metamorphic rocks most damaged by freezing? 
  • How can we tell time without a clock?



Physical Science

First/Second Grade Ideas
  • What solution is the best for bubbles and why?
  • What type of paper makes the best paper airplane?
  • Why should I use a ramp? or other simple machine?
  • Which paper towel brand is the strongest? Most absorbent?
  • What happens when you heat sugar?
  • How do you make your car go faster?
  • Do different types of oil mix or stack?
  • How many times can you fold a piece of paper on itself?
  • Does hot water boil faster than cold water?
  • What type of cup prevents ice from melting?
  • Do some liquids expand more than others when frozen?
  • How does dishwashing liquid clean away oil?
  • Which liquid is more dense - honey, water, or oil?

Third/Fourth Grade Ideas
  • What brand of batteries last the longest?
  • Does the color of hair affect how much static electricity it can carry?
  • What brands of bubble gum produce the biggest bubbles?
  • What type of ball bounces the highest?
  • What is the best way to keep an ice cube from melting?
  • What type of microwave popcorn pops the best?
  • Are eco-friendly packing materials as effective as less eco-friendly materials in protecting a breakable item?
  • How does a parachute work?
  • How to make a potato battery? lemon? etc.?
  • What makes the best super ball?
  • Does adding salt to pasta make it cook faster?
  • What soaps foam in the microwave? Why?
  • Why does salt melt ice?
  • What is the fastest way to cool a can of soda?
  • Does mint actually cool things down?
  • Can Jell-O be made with just warm water instead of hot water?
  • Does the temperature of rubber affect how high it can bounce?
  • What kind of bubble wrap provides the most protection?
  • Does the size of a parachute affect the rate than an object will fall?
  • How well does sound travel through a gas, a liquid, and a solid?
  • Does the volume of play dough in a container change after you have played with it?
  • What is the probability of pulling out your favorite color when you reach into a bag of M&Ms?
  • Can coin flip probability be altered by the individual flipping the coin? 
  • Does gelatin slow down the melting point of freezer pops?

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