Science Buddies: "Ask an Expert"

i have to submit a project within a week. i am interested in making a physics project.it should be related to the following topics;
natural,related to air ,water,something easy which i can easily accomplish at home.i am a 11th grade student.please send details on how to make the project along with theoretical content,construction,working , diagrams.

As the instructions say: Don't ask "What project should I do?" That's a question only you can answer. It is OK to ask something like, "I think project A has this advantage… and project B has this advantage. In your experience, which of those advantages would lead to the best science fair project?" That's a question our experts can help with.

Try our How-To information which has links to some projects ideas. -- Ken