1. The problem statement, all variables and given/known data I have a project for my Materials Science and Engineering class and we have were given 4 unknown materials and we have to determine which kind of materials they are. We have to come up with our own experiments. As of now, I've done the Rockwell hardness test, electrical conductivity tests and have determined the density of each material. I've ran out of ideas for tests to conduct so if anyone has some suggestions that would be greatly appreciated thanks. Two of the materials are some sort of metal discs, one material looks to be a ceramic tile and the other is a foam.