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物理化学实驗梅氏法測定分子量的实驗中,我們将实驗仪器小球下落装置部分进行了一些改进,这样可避免同学因操作不当将小球在蒸发管上部弄破或因用力过猛拉坏蒸发管左面的支管及漏气等現象。改进后装置見图,左面的支管及拉动装置不用了,而改用磁力控制使小球下落。其装置是这样的:在蒸发管上端的橡皮塞上固定二根直径約1毫米、长約2厘米的銅絲,銅絲下端各做成直径約1毫米的圆环,并在二圆环間穿入一根直径約0.5毫米、长2厘米的銅絲,此銅絲一端銲上一直径約1厘米的圆形鎳片或不銹鋼片,其另一近尾端处銲一比圓环直径稍大的銅片
Physical and chemical experiments Mueller method in the determination of molecular weight experiments, we drop the experimental apparatus part of the ball device to make some improvements, so as to avoid the improper operation of the ball will be broken in the upper part of the evaporation tube or pull too hard to evaporate The left branch of the tube and leakage and so on. Improve the device shown in Figure, the left branch and pulling device without, and use the magnetic control to drop the ball. The device is such that two copper wires about 1 mm in diameter and about 2 cm in length are fixed on the rubber stopper at the upper end of the evaporation tube and the lower ends of the copper wires are each made into a ring with a diameter of about 1 mm, Into a diameter of about 0.5 mm, 2 cm long copper wire, one end of the copper wire welded to a diameter of about 1 cm round nickel or stainless steel sheet, and the other near the end of the weld at a diameter slightly larger than the ring Big piece of copper