Refrigerators are popular home appliances. Their cooling principle, temperature control and some phenomena during usage involve a lot of knowledge in thermal study, such as phase transition, the first and second laws of thermodynamics.电冰箱是很普及的家用电器,它的致冷原理、温度控制和使用中的一些现象涉及许多热学知识.如物态变化、热力学第一、第二定律.