Can the refrigerator check the waste oil? Freezing point should not be used as inspection standard

In the past few days, a post on Sina Weibo called “Ground Oil and Life to Make Children into Inventors” was forwarded online. Lin Lizhen, a high school student at Shanghai Xiangming Middle School, came up with the use of semiconductor refrigeration based on the principle that the animal oil content in the used oil was higher and the freezing point of animal oil and vegetable oil was different.

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