Education.com and Science Buddies have good fifth grade science fair project ideas on their websites. Good fifth grade science fair projects include larger sample sizes, more complex mathematical analysis and more reliable averages than in previous grades.
Science fair project ideas include testing which food grows mold the fastest, whether a long paper airplane flies farther than a wide paper airplane and whether plants need water. Science Buddies divides science fair projects into easy, intermediate and advanced categories. Examples of easy projects include measuring the levels of salt in the seas or examining if melting polar ice caps raise ocean levels. An intermediate project is studying the effect of water depth on wave velocity, and an advanced project is examining if hurricanes cool ocean water temperatures.