ISO INTERNATIONAL STANDARD 20765-5 First edition 2022-04 Natural gas Calculation of thermodynamic properties - Part 5: Calculation of viscosity, Joule- Thomson coefficient, and isentropic exponent Gaz naturel - Calcul des propriétes thermodynamiques - Partie 5: Calcul de la viscosite, du coefficient de Joule-Thomson et de I'exposant isentropique Reference number IS0 20765-5:2022(E) ISO @IS02022 IS0 20765-5:2022(E) COPYRIGHT PROTECTED DOCUMENT @ISO2022 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, withoutpriorwrittenpermission.Permission can berequestedfrom eitherIso at theaddress below orIso'smemberbodyinthecountryoftherequester. ISO copyright office CP 401 · Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122 749 0111 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2022 - All rights reserved