This will be your research/guiding question. Come up with a question that you are interested in. Your question needs to be testable and measurable.
Read the following questions and think about what kind of test you could set up to answer them. How would you measure your results?
– How is air volume changed by temperature?
– What is the effect of temperature on the volume of air?
Which of these examples clearly presents a testable and measurable question? Why?
There are three steps to determining a problem:
2A. Brainstorm questions
2B. Research your questions
2C. Analyze your questions
Step 1D: Narrow your topic 
Step 2A: Brainstorm questions 