TS 297

TS 297 is a standard focused on the naming of heat-related quantities and units within the SI system of units, providing symbols, definitions, and conversion factors. It supports consistent technical language for thermal calculations, measurement reporting, and engineering documentation so that the same physical quantity is not described differently from one source to another.

A common language for thermal quantities

In general technical use, heat-related work involves several closely related but distinct quantities such as heat, thermal energy, temperature change, heat capacity, and specific heat capacity. These terms are often confused in everyday language, yet they represent different physical concepts and therefore require different symbols and units. TS 297 addresses this naming framework by organizing the symbols, definitions, and conversion relationships used for these SI quantities.

What the scope means in practice

• It covers heat quantities within the SI system of units.
• It provides symbols and definitions for those quantities.
• It includes conversion factors for the related units.
• It helps maintain uniform notation in thermal calculations and measurement records.
• It is presented as equivalent to ISO 31-4:1992.

Standards of this kind are especially useful in laboratory reporting, textbooks, specifications, and engineering calculations, where terminology consistency matters. More broadly, they help keep SI-based expressions systematic and reduce ambiguity in documentation. TS 297 is best understood as a historical reference for the terminology of this subject area rather than a modern application code, making it useful for interpreting older SI notation and thermal-unit conventions.