Determination of Air Density with Buoyancy Artefacts |
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| Sari Semenoja, Kari Riski and Leena Stenlund |
- Abstract:
- When comparing mass standards with large volume differences the density of air is one of the largest uncertainty components for mass. The air density can be determined by direct weighing using buoyancy artefacts or it can be calculated from the CIPM 81/91 formula. A small relative difference (about 6·10-5) between these two methods exists. The aim of the present work is to verify this difference and to gain experience on vacuum weighing and on the stability of weights. Two buoyancy artefacts with different volumes were utilized. The artefacts were compared in vacuum and in air. From the weighing results air density was calculated and compared with the CIPM formula. The following value for the relative air density difference was obtained 4 x 10-5 (u=7 x 10-5).
- Keywords:
- air density, buoyancy artefacts, vacuum weighing
- Download:
- IMEKO-TC3-2007-063u.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC3
- Event name:
- Cultivating Metrological Knowledge
- Title:
20th Conference on Measurement of Force, Mass and Torque (together with 3rd TC16 Conference on Pressure Measurement & 1st TC22 Conference on Vibration Measurement)
- Place:
- Merida, MEXICO
- Time:
- 27 November 2007 - 01 December 2007