A group of physics students is trying to investigate which method of heat transfer, convection or conduction, is most responsible for the cooling of a hot beverage. The students fill two identical paper cups with hot water (100°C). One cup has a thick insulating lid and the other does not have a lid. The cups are left in a large room at 23°C. After twenty minutes the students measure the temperature of the water in the cups. The cup with the lid was 85°C. The cup without the lid was 79°C.
Based on this evidence alone, what can the students conclude about the energy lost by convection and conduction and why?