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化学试验中,用夭平进行精密衡量样品时。常常遇到天平指针先是慢慢往一个方向移动,经过几十秒钟甚至一、二分钟指针完全倾斜,直至投影屏不再有刻度。这种现象叫做“平衡点漂移”。遇到这种现象,试验就不能正常进行.应当指出,天平“平衡点漂移”现象要区别于天平示值变动性。上面谈到,“平衡点漂移”是指在称量当中平衡点不能停在固定的位置上,且是向一个方向慢慢移动的。而示值变动性是指多次衡量同一物体时,天平平衡在某
In chemical tests, the sample is precisely weighed using a test compound. Often encounter the first scale pointer slowly move in one direction, after a few seconds or even one or two minutes completely tilted pointer, until the projection screen no longer scale. This phenomenon is called “equilibrium drift.” In the event of such a phenomenon, the test can not be carried out normally, and it should be pointed out that the “equilibrium point drift” phenomenon of the balance should be distinguished from the indication fluctuation of the balance. As mentioned above, “drift of balance point” means that the balance point can not be stopped at a fixed position during weighing and slowly moves in one direction. The change of indication refers to multiple measurements of the same object, balance balance in a certain