Abstract
A proposed design and construction for a new apparatus used in measuring the solid density of masses from 1 kg up to 10 kg in the National Institute for Standards (NIS) at Egypt are presented. The apparatus operates manually and automatically for measuring the density of masses of class E using the hydrostatic weighing principle (Archimedes) according to used international standard. The principle of operation of the Hydrostatic Weighing Apparatus (HWA-NIS) depends mainly on measure the masses of the standard and the under test objects both in air and in liquid. The HWA-NIS measures the solid density with uncertainty of ±0.8 kg.m-3at coverage factor k = 2.The HWA-NIS has been used for measuring different nominal masses to validate its performance along the measuring range. The obtained results compared with the standard values. The comparison showed a good agreement between the HWA-NIS outputs and the standard values.
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