I am thinking that heat retention is how long the coffee stays hot in the coffeee cups. I am testing paper, plastic, styrofoam, ceramic, and stainless coffee cups to see which retains heat the longest. I took the temp every 10 minutes of the hot coffee in each cup until reached room temp. Just wanting to know how this all relates to science to beef up my project report. ...intermoleclar forces?? Thermodynamics?? Physics?? LOL!! My experiment is going well..I just want to have an awsome report to go with it any cool science websites that relate to heat retention??