电冰箱的出现给我们的日常生活带来了极大的便利。早先,人们一直直接使用冰制冷。每逢冬季,人们便从河流、池塘中切割大块儿大块儿的冰,用稻草分隔好后存入地窖。需要时,取一个大木头柜子,柜子分两层,下层放冰块儿,上层存放食物。1822年,英国物理学家法拉第发现了一个现象:二氧化碳、氨气、氯气等气体在加压的情况下, The emergence of refrigerators has brought great convenience to our daily life. Earlier, people used ice directly. Every winter, people cut chunks of ice from rivers and ponds, separated them with straw and deposited them in cellars. When needed, take a large wood cabinets, cabinets divided into two layers, the lower ice, the upper store food. In 1822, the British physicist Faraday discovered a phenomenon: carbon dioxide, ammonia, chlorine and other gases under pressure,