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Abstract
Abstract This paper analyses the use of museum showcases as a means of improving the control of the indoor environment for the conservation of works of art. It presents and discusses the influence of the air and gas tightness of a showcase on variations of the relative humidity. Attention is first focused on the basic mechanisms that drive the exchange of water vapour and gas between the inside and outside of the showcase. Testing procedures to characterize their performance (e.g. pressurization tests, tracer gas measurements) are then described and critically reviewed. Finally, examples of laboratory and field measurement results are presented and discussed in order to abstract general recommendations about: how to test the air tightness of showcases and how to choose the most suitable air tightness value, in relation to the desired level of control of the RH.
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