I'm doing a lab on what is the best material for a calorimetre. I chose glass, aluminum, styrofoam cup, paper/cardboard cup and a plastic cup. I've found that the cardboard cup was the best followed by the styrofoam cup. I thought at first it was related to the specific heat capacity of the calorimetre itself, as those values lined up with the results I got from my experiment.
However recently I've been wondering if the specific heat capacity would really have an effect on the exactitude of the results? Should I base myself more on the thermal conductivity values of the materials even though there doesn't seem to be a correlation between those values and those I got from my experiment?