For each trial a different amount of change in variable is used. This produces a different amount of change in the system. You measure this response and record it as data in a table. This is considered raw data because it has not been processed or interpreted. As you do experiments, record all numerical measurements made.
Data can be amounts of chemicals used, how long something is, the time something took, etc.
If you are not making any measurements, you probably are not doing an experimental science project. Your Observations Observations can be written descriptions of what you noticed during an experiment, or problems encountered. Keep careful notes of everything that happens. Observations are valuable when drawing conclusions, and useful for locating experimental errors. Do any calculations needed from your raw data to obtain the numbers needed to draw your conclusions.