Determination of the mass value of E₀ no 74 by calibrating it using the Pt-Ir standard has high complexity. This is caused by a significant difference in the density of standards. In this study, the E₀ no 74 made of stainless steel has a density of 8.051.130 kg.m⁻³ calibrated by a mass standard of Pt-Ir which has a density of 21.552.940 kg.m⁻³. By Archimedes' law, the buoyant force generated by the air due to this density difference is huge.

more »

... the correction of air buoyancy is very important. The air buoyancy correction value is obtained by determining the air density using the CIPM-2007 formula. The correction that arises due to air buoyancy while weighing in the air is -0.00115 g and is greater at higher density. The implication of buoyancy correction is identified by analyzing the equivalence of the measurement result using a reference value from the calibration certificate issued by BIPM. The measurement result is equivalent if -1<En<1. The value for the corrected mass is -0.078.