Identify variables that are relevant to the question you are investigating.Hint: An example of a variable that affects evaporation rate is the temperature of the liquid.

To identify variables relevant to the question you are investigating, follow these steps:

1. Define the Question: Clearly define the question or problem you are investigating. This will help you understand what kind of variables you should be looking for.

2. Brainstorm Possible Variables: Think about all the possible factors that could affect the outcome of your investigation. For example, if you are investigating the rate of evaporation, possible variables could include the temperature of the liquid, the surface area of the liquid, the humidity of the air, and the air pressure.

3. Categorize the Variables: Once you have a list of possible variables, categorize them into independent, dependent, and controlled variables. The independent variable is the one you will manipulate or change. The dependent variable is the one you will measure. The controlled variables are those you will keep constant to ensure that they do not affect the outcome.

4. Prioritize the Variables: Not all variables are equally important. Some may have a greater impact on the outcome than others. Prioritize the variables based on their potential impact on your investigation.

5. Test the Variables: Finally, test the variables through experimentation to see how they affect the outcome. This will help you determine which variables are indeed relevant to your investigation.