ICS 19.040                         LITD 01

Reaffirmed 2023

NATIONAL FOREWORD

This Indian Standard (Part 2/Sec 3) (First Revision) which is identical with IEC 60721-2-1 : 2013 'Classification of environmental conditions - Part 2-1: Environmental conditions appearing in nature - Air pressure' issued by International Electro technical Commission (IEC) was adopted by the Bureau of Indian Standards on recommendation of the Environmental Testing Procedure Sectional Committee, and approval of the Electronics and Information Technology Division Council.

This standard was originally published in 1993 as IS 13736 (Part 2/Sec 3) : 1993 'Classification of environmental conditions : Part 2 Environmental conditions appearing in nature, Section 3 Air pressure'. The first revision of this standard has been undertaken to align it with the latest version of IEC 60721-2-3 : 2013.

The text of IEC Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain terminologies and conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:

a) Wherever the words 'International Standard' appear referring to this standard, they should be read as 'Indian Standard'.

b) Comma (,) has been used as a decimal marker, while in Indian Standards, the current practice is to use a point (.) as the decimal marker.