Abstract
With the revision of the definition of the kilogram, more and more weights made of non-metal material, such as silicon spheres and PM 2.5 film, need to be determined with high accuracy. As conventional mass is commonly used in mass metrology, this paper discusses the mass-measuring process for silicon and PM 2.5 film. Electrostatic eliminators are used to eliminate the electrostatic effects of non-metal material to improve the stability of mass measurement. Due to the big difference of weights’ densities, the air buoyancy correction and its uncertainty evaluation are also conducted.
Highlights
There are more and more demands in mass metrology for mass measurement of non-metal material [1,2,3,4]
In which mt and mr are the mass of test weight and reference weight; Vt and Vr are the volume of test weight and reference weight; ρa is density of moist air; ∆I is indication difference of the balance; mcs is the conventional mass of the sensitivity weight; and ∆Is is the indication difference of the balance when the sensitivity weight is put on the weighing pan
For the 1 kg silicon sphere, the density of silicon is (2320 ~ 2340) kg·m-3, the air buoyancy for the true mass is around 370.795 mg. while measuring in air with density of 1.1834 kg·m-3, the air buoyancy correction for the conventional mass can be 5.1 mg, which means that the air density including the air temperature, relative humidity, air pressure and contents of CO2 need to be determined with high accuracy for the air buoyancy correction
Summary
There are more and more demands in mass metrology for mass measurement of non-metal material [1,2,3,4]. Electrostatic effects and air buoyancy correction become the two most important aspects for the determination of mass object of non-metal material.
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