Here is a list of great science fair experiment ideas. The key to creating science fair winning projects, is to understand what the judges are looking for in your science fair project.

• Is your project full of original and unique ideas? Did you clearly describe the problem you were researching? Be sure you know your material for your final report. Was your science fair project too easy? A difficult project can make a difference in how the judges grade it.
• Are you knowledgeable about the experiment itself? Did you design it and perform the experiment like descibed? Having a good command of the technical aspects of your project reflects very well on you. Know what you’re talking about, and know your experimental data.
• Was your data collection scientifically accuate? Be sure to use a journal to record data from the experiment. This demonstrates great organization. Did you repeat the experiment? Repetition lends much more reliability to your data.
• Did you use tables and graphs that were helpful to the judges in understanding your data? Did you use the tables and graphs correctly and collect enough data to reach a real conclusion? Science is all about realiable data and proof.

Here are some great science fair examples:

• How do differences in surfaces affect the adhesion of tape?
• If you shake up different kinds or brands of soft drinks, will they all spew the same amount?
• Are all potato chips equally greasy?
• Do the same types of mold grow on all types of food?
• Does light effect the rate at which foods spoil and mold?
• Can you use a household water filter to remove flavor or color from other liquids?
• Does the power of a microwave affect how well it makes popcorn?
• Do all brands of diapers absorb the same amount of liquid? Does it matter what the liquid is?
• Can earthworms detect smell?
• Do magnetic forces pass through different liquids?
• Are insects attracted to night lamps because of heat or light?
• Can you make Jello using fresh pineapples instead of canned pineapples?
• Do white candles burn at a different rate than colored candles?
• When is the best time to plant soy beans?
• How does arch curvature affect load carrying strength?
• Can a saturated solution of sodium chloride still dissolve Epsom salts?
• Does magnetism affect the growth of plants?
• How does the shape of an ice cube affect how quickly it melts?
• Do different brands of popcorn leave different amounts of unpopped kernels?
• Will chilling an onion before cutting it keep you from crying?
• How accurately do egg producers measure eggs?
• What percentage of an orange is water?
• What time of day is preferred by birds for feeding?
• What ratio of vinegar to baking soda produces the best chemical volcano eruption?
• Is white really a combination of all the primary colors?
• How does water purity affect surface tension?
• Do some substances reflect light better than others?
• Are optical illusions perceived differently by individuals of different genders, age, etc.?
• What solutions does light pass through the best?
• Do different liquids have different boiling and freezing points?
• Which material is the best insulator?
• What conditions affect the ripening of fruit? Look at ethylene and enclosing a fruit in a sealed bag, temperature, light, or nearness to other pieces or fruit.
• How are different soils affected by erosion? You can make your own wind or water and evaluate the effects on soil. If you have access to a very cold freezer, you can look at the effects of freeze and thaw cycles.
• Does the presence of detergent in water affect plant growth?
• Do roots always grow down and stems upward, no matter how you plant the seed?
• Do bean plants grow better under artificial or natural light?
• What plants will produce a color dye?
• What animals are visitors to my outdoor study area during a given week?
• How do different foundations stand up to earthquakes?
• What materials glow under black light? Can you use the UV light to find invisible, possibly smelly, stains in your carpet or elsewhere in your house?
• Do all dishwashing detergents produce the same amount of bubbles? Do some clean better than others?
• Is the nutritional content of different brands of a vegetable the same?