– the intergovernmental organization through which Member States act together
     on matters related to measurement science and measurement standards.
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International Association for the Properties of Water and Steam

The International Association for the Properties fo Water and Steam (IAPWS) is an international non-profit association of national organizations concerned with the properties of water and steam, particularly thermophysical properties, cycle chemistry, and other aspects of high-temperature steam, water and aqueous mixtures that are relevant to thermal power cycles and other industrial applications.

Links between the BIPM and the IAPWS:

  • IAPWS presentation at the 20th meeting of the CCQM (2014).
  • BIPM presentation at the ICPWS16: 16th International Conference on the Properties of Water and Steam.
  • Development of a position paper on: "Metrological challenges for measurements of key climatological observables: Oceanic salinity and pH, and atmospheric humidity".
  • IAPWS is the co-opted member of CCT Working Group for Humidity (CCT-WG-Hu).

BIPM contact(s):
IAPWS contact(s):
  • Dr Rainer Feistel, Vice-Chair of the Subcommittee on Seawater