A really good question Jenny. I asked my friends about it and they came up with the following thoughts.
Many thanks friends. Some interesting thoughts. Hardness and Strength seem to be two different things. How would you measure softness? If you work out a way then maybe you are measuring hardness as well. Think about it. I also like the idea of measuring strength by looking at one material. Different types of paper seems to be a good idea. You will have to make sure that you do a ‘fair’ test. Not sure what I mean …. ask a question.