一、序用此方法测定高相对密度试样的密度,其精度较一般借助在液体中静力平衡以天秤进行测定的经典方法可高一个数量级。其偏差容易控制在0.1%以下,特别是对微小试样的测定更为适用。二、方法原理假若将一选用的试样与一浮子组成一个系统,并且将此系统置于液体(例如水)中。如果此系统的整体密度恰与此时液体的密度相等,那么系统将静止在水中不动;相反如果此系统的整体密度比水大(或小),则此系统将下沉(或上升)。由于系统对浮力的微小变化,也就是对液体密度的微小变化非常敏感,而液体的密度又是随着温度而精 First, the order of using this method to determine the density of high relative density samples, the accuracy of the general than in the liquid by static balance with the scale of the classical method can be an order of magnitude higher. The deviation is easy to control at 0.1% or less, especially for the determination of small samples is more applicable. Second, the principle of the method If a selected sample and a float to form a system, and the system is placed in a liquid (such as water). If the overall density of the system is exactly equal to the density of the liquid at this time, the system will stand still in the water; conversely, if the overall density of the system is larger (or smaller) than water, the system will sink (or rise). Due to the small changes in buoyancy the system is very sensitive to small changes in liquid density, which in turn are refined with temperature