CIPM MRA COMPARISON REPORTS

SUPPLEMENTARY COMPARISON

AFRIMETS.M.D-S2

Density of liquids

M. Hamdy , R. Alyousefi , B. Lugadiru , J. Ishabaganzi , S.P. Mukwaya , J. Omara

Citation M. Hamdy et al 2026 CIPM MRA Comparison reports 07012

https://doi.org/10.59161/EWDP4945

Authors

Mohamed Hamdy

https://orcid.org/0000-0002-5737-3241 National Institute for Standards (NIS) Egypt

Rayan Alyousefi National Measurement and Calibration Center - Saudi Standards, Metrology and Quality Organization (SASO-NMCC) Saudi Arabia

Beatrice Lugadiru Kenya Bureau of Standards (KEBS) Kenya

Jenitha Ishabaganzi Tanzania Bureau of Standards (TBS) Tanzania

Simon Peter Mukwaya Tanzania Bureau of Standards (TBS) Tanzania

Jonathan Omara Tanzania Bureau of Standards (TBS) Tanzania

Abstract

This report presents the results of the supplementary comparison AFRIMETS.M. D-S2, which covers the determination of the density of two reference liquids (Fluorinert FC-40 and Distilled Water) at a temperature of 20 °C and an atmospheric pressure of 101 325 Pa.

Five National Metrology Institutes (NMIs) participated in the comparison, using oscillation-type density meters approved as national standards of density measurement in their respective countries. Measurements were performed between July 2023 and December 2024 using Anton Paar DSA 5000M Digital Density meter.

The stability and homogeneity of the reference liquids were verified by the Pilot Laboratory (NIS, Egypt), which found no significant drift or inhomogeneity during the measurement period. Therefore, the influence of these factors was considered negligible in the uncertainty evaluation.

Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/.

The final report has been peer-reviewed and approved for publication by the CCM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

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