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Title: An Investigation Into The Effect Of Vacuum Exposure On Mass Standards
Author: Stuart Davidson
Source: 1999 Measurement Science Conference
Year Published: 1999
Abstract: A programme of work has been undertaken to investigate the behaviour of mass standards when transferred to and stored in vacuum. Special sets of kilogram artefacts, one of stainless steel and one of platinum-iridium, were manufactured to evaluate the behaviour of these materials both when transferred into and out of vacuum and when stored in vacuum over long periods. Mass measurements were performed using two one kilogram mass comparators, one in air and one under vacuum. The results of the measurements made over an 18 month period are given and conclusions drawn regarding the change in mass per unit surface area for the two materials as well as their long term stability in vacuum.

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