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Revisiting relative humidity: conceptual ambiguities and applicability conditions

2026-01-15Artigo científico Acesso restrito
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datacite.subject.sdg13:Ação Climática
datacite.subject.sdg06:Água Potável e Saneamento
datacite.subject.sdg11:Cidades e Comunidades Sustentáveis
dc.contributor.authorRuivo, Celestino
dc.contributor.authorCosta, Vítor A. F.
dc.contributor.authorDomínguez-Muñoz, Fernando
dc.date.accessioned2026-03-17T11:37:56Z
dc.date.available2026-03-17T11:37:56Z
dc.date.issued2026-01-15
dc.description.abstractThe state of moist air significantly impacts human comfort, human health, preservation of goods and food, and many processes. At a given pressure, it is usually defined by one pair of independent variables, one invariably the dry bulb temperature, and the other the humidity ratio, the relative humidity, or the specific enthalpy. Relative humidity is a widely referred to and used concept. However, there is no consensus on its definition. The different definitions in literature are not clear enough, and are prone to misleading and questionable numerical values. This is especially relevant for high temperatures when using psychrometric charts, online calculators, simulation tools, software of measuring systems, and home-made routines or numerical tools. This work aims to highlight how and why the concept of relative humidity needs to be clearly and uniquely defined, and why care is needed concerning its applicability conditions. Additionally to the given explanations, mathematical expressions are used to do that more clearly and accurately. The main key issues raised in this paper are related to the consideration, and use of relative humidity when moist air temperature exceeds the water saturation temperature corresponding to the prevailing total pressure.eng
dc.description.sponsorshipLA/P/0079/2020
dc.identifier.doi10.1080/23744731.2025.2607309
dc.identifier.eissn2374-474X
dc.identifier.issn2374-4731
dc.identifier.urihttp://hdl.handle.net/10400.1/28443
dc.language.isoeng
dc.peerreviewedyes
dc.publisherTaylor and Francis Group
dc.relationAssociate Laboratory of Energy, Transports and Aeronautics
dc.relationAssociate Laboratory of Energy, Transports and Aeronautics
dc.relation.ispartofScience and Technology for the Built Environment
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectThermodynamic properties
dc.subjectPsychrometric charts
dc.subjectMoist air
dc.subjectWater
dc.titleRevisiting relative humidity: conceptual ambiguities and applicability conditionseng
dc.typejournal article
dspace.entity.typePublication
oaire.awardNumberUIDB/50022/2020
oaire.awardNumberUIDP/50022/2020
oaire.awardTitleAssociate Laboratory of Energy, Transports and Aeronautics
oaire.awardTitleAssociate Laboratory of Energy, Transports and Aeronautics
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F50022%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F50022%2F2020/PT
oaire.citation.endPage181
oaire.citation.issue2
oaire.citation.startPage163
oaire.citation.titleScience and Technology for the Built Environment
oaire.citation.volume32
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameRuivo
person.givenNameCelestino
person.identifier.ciencia-id9A17-9D4B-A0A9
person.identifier.orcid0000-0002-3915-0554
person.identifier.ridI-7712-2015
person.identifier.scopus-author-id14020628300
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
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