Specific Heat Capacity of a Metal Lab

About 4 days ago, we did a lab to measure the specific heat of metals. My group did Copper. The procedure told us to get the metal to 100.0 degree Celsius and then drop it into room temperature water and then measure the highest temperature. This allowed us to calculate the specific heat of the metal. We did all of this and somehow yielded a percent error of only 1.55%!!! I don't know how but we did a great job on this lab. We weren't graded on percent error but I was still pretty happy. Here are a few pictures from the lab.