高二物理讲到晶体各向异性时,是以云母实验它的导热性。在云母表面涂一层薄蜡,用烧红的金属丝压在云母一点上,于是熔化了的蜡成椭圆形,但不够明显,因金属丝的热量易于散发,不能传到比较远的同一晶面上。因此改用一根稍粗的铜丝,使弯曲成直角状,首先将一端置酒精灯上加热,再继续加热弯曲处,同时 High school physics when it comes to crystal anisotropy, mica is its experimental thermal conductivity. Apply a thin layer of wax on the surface of the mica and press the reddish wire against the mica. The melted wax is oval, but not so pronounced because the heat of the wire is easily dissipated and can not reach the same crystal Face. So switch to a slightly thicker copper wire, so that bending into a rectangular shape, the first end of the alcohol lamp heating, and then continue to heat the bend, at the same time