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用圆规在一张厚图画纸上画一个直径8厘米的圆盘,剪下来,在圆盘上均匀剪8个3厘米长的开口,然后把圆盘折成风车状。用一枚大头针把这个小风轮悬挂在一个纽扣形的磁铁上,这样你就可以看出室内空气流动的状况了。通过它的旋转不仅可以看到暖气上方的热气上升,而且还可以通过它的倒转感觉到冷空气的运动,比如在隔温较差的外墙附近。风轮旋转越快,说明气流越强。由于它是悬挂在一个敏感的磁铁上,所以任何一点微弱的空气流动都能测出来。
Use a compass to draw a 8 cm diameter disc on a thick drawing paper, cut it out, cut eight 3 cm long openings evenly on the disc, and then fold the disc into a windmill. Use a pin to hang this small wind wheel on a button-shaped magnet so that you can see the flow of indoor air. Through its rotation, not only can the rise of hot air above the heating be seen, but it can also sense the movement of cold air through its inversion, such as near the exterior wall with poor insulation. The faster the wind wheel rotates, the stronger the air flow. Since it is suspended on a sensitive magnet, any slight weak air flow can be measured.