Science fair project idea that compares number and relative sizes of leaf stomata. Collect leaves of plant species, identify, observe stomata with microscope.

This science project involves comparing the relative effectiveness of salt, pepper and dehydration in food preservation.

In this activity, students will think about the form and function of household objects as they compare and contrast kitchen serving spoons of various sizes and designs.

Science fair project that compares tree leaf size and shape based on the leaf's position in the tree. Is their is a noticeable difference between high and low?

This project explores whether nails, toothpicks, straws, or pen nibs are best for applying ink to paper.

In this fun science fair project idea learn the difference between additive and subtractive color and why they are handled differently.

Compare air temperature with the infrared temperature from a reflecting surface at different times of the day, in shade and in sunlight.

Science fair project that helps you better understand density by comparing the relative densities of cans of Coke and Diet Coke.

How do cold packs work? Explore endothermic reactions by comparing the temperature change that results from various chemicals added to water to find out!

The project compares three different methods of testing turbidity in water: the secchi disk, spectrophotometer, and turbidity test kit.

Science fair project idea that measures fuel efficiency in cars. Calculate cost per mile by comparing fuel cost and consumption data.

Determine the efficiency of multi-tasking by comparing how long it takes students to complete different tasks. Collate data, complete Summary Chart.

This science fair project idea highlights decomposition rates by comparing how long it takes an item to decompose in a compost pile vs. a landfill.

This science fair project explores discover whether the acidity of sour candy is comparable to that of battery acid.

In this science project idea learn about working of different types of smoke detectors and find out which one is the most effective for you.

Science fair project which identifies the most effective insulator that you could use to make a winter coat by comparing how well cloth and cotton trap heat.

Boost your preschooler's attention to detail by getting her to explore the differences between two different pumpkins: large and small.

In this science fair project you will make a model of a cell membrane using very simple material.

Science fair project that examines the relationship between the size of a bubble and how quickly it falls. What is the correlation?

This experiment investigates whether there are certain sounds that affect men and women differently

This project demonstrates the correspondence between the volume of water displaced by a submerged object and the volume of the object displacing it.

Will storing cucumbers and tomatoes in the fridge destroy their unique flavors? Find out in this science fair project idea!

How greasy are your potato chips? Students will use a reliable method to quantify greasiness and compare different brands in this great science fair project.

This project determines the age of a tree using a growth factor chart instead of cutting the tree down to count the rings in its base.

Determine how good we are at direct and indirect observation.

How can we describe the relationship of magnetic field strength vs. distance? Kids will find out with this free science fair project idea.

Can the force of air be used to propel a vehicle? This science experiment provides step-by-step instructions to help you answer this question.

This experiment evaluates whether a person's eye color affects their ability to identify colors in low light.

In this science fair project, students will learn how to calculate the formula for the thermal decomposition of potassium chlorate.