1.1 This guide covers uniform methods for expressing temperature, temperature values, and temperature differences.
1.2 This guide is intended as a supplement to IEEE/ASTM SI-10.
IEEE/ASTM SI-10
Standard for Use of the International System of Units (SI): The Modern Metric System
E344-26a
Terminology Relating to Thermometry and Hydrometry (Includes all amendments and changes 4/21/2026).