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Density of water: roles of the CIPM and IAPWS standards

A H Harvey1, R Span2, K Fujii3, M Tanaka3 and R S Davis4

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This contribution discusses the relative roles of the standard formulation for the density of liquid water recommended for metrology by the International Committee for Weights and Measures (CIPM) in 2001 and the thermodynamic property formulation adopted by the International Association for the Properties of Water and Steam (IAPWS) in 1995. The two formulations give consistent results for densities in the region of validity of the CIPM standard. Guidelines are presented for the appropriate use of the two formulations.


PACS

06.30.Dr Mass and density

65.20.-w Thermal properties of liquids

05.70.Ce Thermodynamic functions and equations of state

06.20.fb Standards and calibration

Subjects

Soft matter, liquids and polymers

Instrumentation and measurement

Statistical physics and nonlinear systems

Dates

Issue 3 (June 2009)

Received 6 November 2008, in final form 15 January 2009

Published 24 February 2009



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