ISO INTERNATIONAL STANDARD 80000-1 Second edition 2022-12 Quantities and units - Part 1: General Grandeurs et unités - Partie 1: Généralités iTeh STANDARD PREVIEW (standards.iteh.ai) ISO 80000-1:2022 https://standards.iteh.ai/catalog/standards/sist/a50c0a3c-015f-4133-87f8. 6b9975762860/is0-80000-1-2022 Reference number IEC IS0 80000-1:2022(E) tSo @IS02022 IS0 80000-1:2022(E) iTeh STANDARD PREVIEW (standards.iteh.ai) ISO 80000-1:2022 https://standards.iteh.ai/catalog/standards/sist/a50c0a3c-015f-4133-87f8 6b9975762860/is0-80000-1-2022 COPYRIGHT PROTECTED DOCUMENT @ IS0 2022 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 or ISO's member body in the country of the requester. ISO copyright office CP 401 · Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Email: copyright@iso.org Website: www.iso.org Published in Switzerland i @ IS0 2022 - All rights reserved IS0 80000-1:2022(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references 3 Terms and definitions ..1 4 Quantities ..1 4.1 The concept of quantity .1 4.2 System of quantities - Base quantities and derived quantities .2 4.3 Universal constants and empirical constants . .2 4.4 Constant multipliers in quantity equations .3 4.5 International System of Quantities, ISQ 3 5 Dimensions .3 6 Units. .5 6.1 General .5 6.2 Units and numerical values .5 6.3 Mathematical operations .5 6.4 Quantity equations and numerical value equations .6 6.5 Coherent systems of units .7 Printing rules .7 7.1 Symbols for quantities 7 7.1.1 aosea General.. .7 7.1.2 Subscripts .7 7.1.3 Combination of symbols for quantities .8 7.1.4 Expressions for quantities .9 7.1.5 Expressions for dimensions .10 7.2 Numbers ..10 7.2.1 General .10 7.2.2 Decimal sign 10 7.2.3 Multiplication and division 11 7.2.4 Error and uncertainty ..12 7.3 Chemical elements and nuclides ..13 7.4 Greek alphabet. .14 Annex A (normative) Specific terms used for quantities ..15 Annex B (normative) Rounding of numbers. ..19 Bibliography .22 IS0 2022 - All rights reserved i