ISO 1
In today's article, we are going to address the topic of ISO 1, a topic that has generated great interest in recent times. ISO 1 is a topic that impacts people of all ages and backgrounds, and its implications are diverse and significant. Throughout this article, we will explore the different aspects of ISO 1, from its origins and history to its impact on today's society. Additionally, we will examine different perspectives and opinions on ISO 1, with the goal of providing a balanced and complete view on the topic. Read on to find out everything you need to know about ISO 1!
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ISO 1 is an international standard set by the International Organization for Standardization that specifies the standard reference temperature for geometrical product specification and verification. The temperature is fixed at 20 degrees Celsius (°C), which exactly equals both 293.15 kelvin (K) and 68 degrees Fahrenheit (°F).
Due to thermal expansion, precision length measurements need to be made at (or converted to) a defined temperature. ISO 1 helps in comparing measurements by defining such a reference temperature. The reference temperature of 20 °C was adopted by the CIPM on 15 April 1931, and became ISO recommendation number 1 in 1951. It soon replaced worldwide other reference temperatures for length measurements that manufacturers of precision equipment had used before, including 0 °C, 62 °F, and 25 °C. Among the reasons for choosing 20 °C was that this was a comfortable and practical workshop temperature and that it resulted in an integer value on both the Celsius and Fahrenheit scales.
It was the first ISO standard, issued originally as ISO/R 1, a ISO Recommendation.
See also
References
- ^ "ISO 1:2016 - Geometrical product specifications (GPS) -- Standard reference temperature for the specification of geometrical and dimensional properties". Iso.org. 2016-08-26. Retrieved 2016-09-15.
- ^ Ted Doiron: 20 °C—A Short History of the Standard Reference Temperature for Industrial Dimensional Measurements Archived 2013-02-17 at the Wayback Machine. Journal of Research of the National Institute of Standards and Technology, Vol. 112, No. 1, January–February 2007.
- ^ Tranchard, Sandrine (2017-02-23). "ISO celebrates 70 years". ISO. Retrieved 2023-08-10.
