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在酷热难耐的夏天,许多家庭都要用电风扇来解暑降温,这是一个司空见惯的现象.但是你有没有想过:是不是电风扇一吹,周围空气的温度就会降低呢? 我们来做个实验:用电风扇吹一支干燥的温度计,你会发现温度计
In summers when extreme heat is hard to resist, many families have to use electric fans to relieve summer heat. This is a common phenomenon. But have you ever wondered if the fans will blow and the temperature of the surrounding air will drop? Do an experiment: blow a dry thermometer with a fan and you will find the thermometer