Six European metrological institutes compared their calculation methods, and estimated uncertainties, resulting in the derivation of the effective area A 0 (20 °C, p atm ) of six piston–cylinder assemblies routinely in use in pressure balances that are primary standards of the pressure laboratories, operating in different pressure ranges in gas (up to 1 MPa) and in liquid (up to 1 GPa). The results for A 0 and its standard uncertainty u ( A 0 ) are presented and compared.
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Molinar et al. (2005) studied this question.