Uncertainty of factor Z in gravimetric volume measurement

Abstract

<p class="Abstract">In the gravimetric volume measurement method, the factor <em>Z</em> is generally used to facilitate an easy conversion from the apparent mass obtained using a balance to the liquid volume. The uncertainty of the measurement used for the liquid volume can be divided into two specific contributions: one from the components related to the mass measurements and one from those related to the mass-to-volume conversion. However, some ISO standards and calibration guides have suggested that the uncertainty due to the factor <em>Z</em> is generally neglected in the uncertainty calculation pertaining to gravimetric volume measurement. This paper describes the combined effects of the density of the water, the density of the reference weights, and the air buoyancy on the uncertainty of factor <em>Z</em> in terms of how they subsequently affect the uncertainty of the measurement results.</p>

Indirect Determination of the Internal Diameter of Glass Conical Volumetric Instruments

“…The uncertainty during liquid volume measurement with the gravimetric method has several influence quantities, like the water and air densities, the mass pieces density, temperature, etc. However, it has been well established that the higher experimental contribution to the volume determination uncertainty comes from the meniscus reading (euramet CG-19, 2018;iso 4787, 2010;astm E542-01, 2012;Win, 2021). The meniscus reading depends on the technical skills of the operator in locating the lowest point of the (usually) concave meniscus, and on the internal diameter of the volumetric instrument at each graduation line of interest (euramet CG-19, 2018;iso 4787, 2010).…”