Results of the key comparison CCM.FF-K4 for volume of liquids at 20 L and 100 mL

This is the authors' abstract. We don't add key points for this paper.

A key comparison was performed in order to compare national measurement systems to determine volume of liquids, particularly at fixed volumes of 20?L and 100?mL. The participants were CENAM (Mexico), NIST (United States of America), NRC/MC (Canada), SP (Sweden), PTB (Germany), INRIM (former IMGC, Italy), NMIA (Australia) and INMETRO (Brazil). CENAM acted as pilot laboratory. The measurements were carried out from December 2003 to March 2005. The chosen values of volume (20?L and 100?mL) are both representatives of the Calibration and Measurement Capabilities (CMCs) declared by most of the participating national metrology institutes. The transfer standards (TSs) were three stainless steel pipettes for volume at 20?L and six commercially available glass pycnometers for volume at 100?mL. Prior to the beginning of the key comparison, the 20?L TSs were tested by CENAM, SP and NMIA The results of the test phase showed excellent values for both repeatability and reproducibility. During the CCM.FF-K4, the results of most of the laboratories showed good agreement with the reference values. The best estimation of the measurands, as reported by the participants showed a general agreement better than ?0.0025% for volume of liquids at 100?mL and 20?L. Main text. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by the CCM, according to the provisions of the CIPM Mutual Recognition Arrangement (MRA).