Guidelines for Examination - Table of Contents   PART C GUIDELINES FOR SUBSTANTIVE EXAMINATION   CHAPTER II CONTENT OF A EUROPEAN PATENT APPLICATION (OTHER THAN CLAIMS)   CHAPTER II Annex UNITS RECOGNISED IN INTERNATIONAL PRACTICE AND COMPLYING WITH RULE 49(11) (see II,...       1. SI units and their decimal multiples and submultiples     1.1 SI base units     1.1.1 Special name and symbol of the SI unit of temperature for expressing Celsius temperature

Celsius temperature t is defined as the difference t = T-To between the two thermodynamic temperatures T and To where To = 273.15 K. An interval of or difference in temperature may be expressed either in kelvins or in degrees Celsius. The unit of 'degree Celsius' is equal to the unit 'kelvin'.