期刊
JOURNAL OF RESEARCH OF THE NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY
卷 113, 期 1, 页码 29-67出版社
NATL INST STANDARDS & TECHNOLOGY-NIST
DOI: 10.6028/jres.113.005
关键词
calibration; density; standard reference material; toluene; uncertainty
The density of liquid toluene has been measured over the temperature range -60 degrees C to 200 degrees C with pressures up to 35 MPa. A two-sinker hydrostatic-balance densimeter utilizing a magnetic suspension coupling provided an absolute determination of the density with low uncertainties. These data are the basis of NIST Standard Reference Material (R) 211d for liquid density over the temperature range -50 degrees C to 150 degrees C and pressure range 0.1 MPa to 30 MPa. A thorough uncertainty analysis is presented; this includes effects resulting from the experimental density determination, possible degradation of the sample due to time and exposure to high temperatures, dissolved air, uncertainties in the empirical density model, and the sample-to-sample variations in the SRM vials. Also considered is the effect of uncertainty in the temperature and pressure measurements. This SRM is intended for the calibration of industrial densimeters.
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