BS ISO BRITISH STANDARD 8778:2003 Pneumatic fluid power Standard reference atmosphere ICS 23.100.01 BSi NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW British Standards BSISO 8778:2003 National foreword This British Standard reproduces verbatim IS0 8778:2003 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee MCE/18, Fluid power systems and components, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may befound in the BSI Catalogue under the section entitled "International Standards Correspondence Index", or by using the"Search" facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not ofitselfconfer immunity from legal obligations. This British Standard was Summary of pages published under the authority This document comprises a front cover, an inside front cover, the ISO title page, of the Standards Policy and pages ii to v, a blank page, pages 1 to 10, an inside back cover and a back cover. Strategy Committee on 21 March 2003 The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments @ BSI 21 March 2003 ISBN058041437X BSIS08778:2003 INTERNATIONAL ISO STANDARD 8778 Second edition 2003-03-15 PneumaticfluidpowerStandard reference atmosphere TransmissionspneumatiquesAtmospherenormaliseedereference Reference number ISO 8778:2003(E) ISO BS ISO 8778:2003 ii BSIS08778:2003 Contents Page Foreword. iv Introduction 1 Scope.. 2 Normativereferences 3 Terms and definitions. 4 Standard reference atmosphere..... 5 Identificationstatement (Referenceto this International Standard).... AnnexA(informative)Alternativereferenceatmospheresanddeterminationofhumidityand density.... Annex B(informative)Development of equations for relative humidity, density and error analysis.....5 Bibliography ili BSIS08778:2003 Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies technical committees. Each member body interested in a subject for which a technical committee has been InternationalElectrotechnicalCommission(lEC)onallmattersofelectrotechnicalstandardization. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2 The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. IsO shall not be held responsible for identifying any or all such patent rights. ISO 8778 was prepared by Technical Committee ISO/TC 131, Fluid power systems, Subcommittee SC 5, Controlproductsandcomponents. Thissecondeditioncancelsandreplacesthefirstedition(lsO8778:1990),whichhasbeentechnicallyrevised iv BSIS08778:2003 Introduction In gas, most commonly permit comparison of data obtained under various pressure conditions. V