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First Edition Preface Second Edition Preface Acknowledgments
Celsius temperature scale—Same as centigrade temperature scale, by convention. The Ninth General Conference on Weights and Measures in 1948 replaced the designation “degree centigrade” by “degree Celsius.” Originally, Celsius took the boiling point of water at 1000 mb pressure as 0° and the ice point as 100°, which is inverted from the present-day temperature scale. Compare Fahrenheit temperature scale.