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为了说明晶体导热性能的各向异性和非晶体导热性能的各向同性。解决实验室〈特别是区中学〉没有云母片的困难,我找了6只500pF的旧云母电容,去其外壳,共得到了24张长7mm,宽4mm,厚0.4mm的云母片,在其上面均匀地涂上一层薄石蜡〈同样在24张薄玻片上均匀地涂上一层薄石蜡,交换使用可供48人同时实验〉。让学生将大头针在酒糟灯上加热,使针尖受热发
In order to illustrate the anisotropic thermal conductivity of the crystal and the isotropy of the amorphous thermal conductivity. To solve the problem that laboratories (especially district secondary schools) did not have mica films, I found six 500pF old mica capacitors and went to the outer shell. A total of 24 pieces of mica with a length of 7mm, a width of 4mm, and a thickness of 0.4mm were obtained. Apply a thin layer of paraffin evenly on the top (also apply a thin layer of paraffin evenly on 24 thin slides, and exchange for 48 people simultaneously). Ask the students to heat the pin on the distillery lamp so that the needle tip is heated