The discussion is where you analyse and interpret your results, and identify any experimental errors or possible areas of improvements.
You should divide your discussion as follows:
Trends in the results
Describe the ‘trend’ in your results. That is, the relationship you observed between your independent and dependent variables.
Scientific explanation
Provide an explanation of the results using scientific knowledge, theories and any other scientific resources you find.
Discussion on validity and reliability
Suggest possible improvement
Identify any errors or risks found in the experiment and provide a method to improve it.If there are none, then suggest new ways to improve the experiment design, and/or minimise errors and risks