The "heavy snow" solar term has passed, and the weather temperature has been getting lower and lower recently. In class, the students' writing hands are almost frozen, but fortunately, the students al

The "heavy snow" solar term has passed, and the weather temperature has been getting lower and lower recently. In class, the students' writing hands are almost frozen, but fortunately, the students all know how to read palms. Are you working? thermal transmission

Test and analysis: There are two ways to change internal energy, namely, doing work and heat transfer. The essence of heat transfer is the transfer of energy from a high-temperature object to a low-temperature object, that is, the process of doing work is the transformation of energy. Friction is a way to change the internal energy of hands, while sunbathing is to transfer heat to the low-temperature body through the high-temperature sun, which is called heat transfer.