When you reach high school, you are expected to gain considerable hands-on experience in practical work. Science fairs are a medium through which students can exhibit their scientific endeavor at full tilt. Students should pick topics in which they are interested, and then come up with an idea that will be appreciated by everyone. Science Project Topics for High School Students Measurement of Bacterial Growth You can perform a bacterial assay by culturing a microorganism in a growth medium. Usually E.coli is used as a specimen. To perform this experiment you can keep the temperature constant, and then culture the bacteria on different agar plates. The experiment could also be performed in many ways, viz. using streak dilution method, culture plates method, etc. Observe the growth of bacteria after 12, 24, and 36 hours. You can measure the growth with the help of a UV spectrophotometer. Note down the growth rates and chart it on a graph. If the experiment has been conducted without any contamination, you will get distinct phases of growth, i.e., lag, exponential, stationary, and death phase. This experiment is quite interesting, but has to be performed very carefully in a sterile environment. Titration Experiment Titration is done for qualitative and quantitative analysis of acids and bases. While performing quantitative analysis, the molarity of the unknown acid solution is determined by checking at what concentration of the added base neutralization takes place. The equipment consists of a burette, beaker, and a clamp for holding the burette. Students usually find out the molarity of the unknown acid by using a known quantity of sodium hydroxide (NaOH) solution. While performing qualitative analysis, the acid dissociation constant of different acids is determined. You can also try back titration and redox titration. Prism Experiment Performing different kinds of experiments with the help of a prism is very absorbing for students. You can perform some experiments with the help of a prism, such as refraction of light, and the formation of a spectrum. When light passes through a prism, it splits into its constituent colors of different wavelengths. Demonstrating this nature of light is a wonderful idea. Some Other Topics

• How does cloning work? What are its benefits?
• How can you prevent soil erosion?
• Experiment to demonstrate the effect of static friction vs kinetic friction.
• The effect that an increase in oxygen and carbon dioxide has on the germination of seeds.
• What is the phenomenon behind plant autotoxicity?
• How does a television set work?
• What is allelopathy? How do some plants manage to inhibit the growth of neighboring plants?
• Do all soil types have the same erosion rate, provided that the environmental conditions are same? Which soil type is resistant to erosion?
• Various chemical setups to perform dry ice experiments.
• Studying phototropism and geotropism in plants.
• An experimental setup to depict plants growing hydroponically and in soil medium.
• Prove Archimedes' principle of buoyancy.
• The effects of preservatives and sweeteners on the nutritional value of food.
• Demonstrating the existence of symbiotic relationship between plants and bacteria.
• An experiment to show the formation of Aurora.
• Experiment testing the electrical conductivity of various materials.
• Electrolysis of water.
• An experimental setup on culturing mushrooms.
• How do you reduce friction with an air stream?
• Different methods of air purification.

We all know that science is a vast discipline, and therefore, you must select a topic that is distinct from others. All the best!