What empirical scale?

Answer 1

Empirical scales are based on the measurement of physical parameters that express the property of interest to be measured trough some formal, most commonly a simple linear, functional relationship. For the measurement of temperature, the formal definition of thermal equilibrium in terms of the thermodynamic coordinate spaces of thermodynamic systems, expressed in the zeroth law of thermodynamics, provides the framework to measure temperature.

Answer 2

An empirical scale is a measurement scale that uses observed or perceptible qualities, such as size or weight, rather than abstract concepts. It relies on objective evidence and measurable data to quantify and categorize phenomena. Examples include measuring temperature in degrees Celsius or ranking satisfaction on a scale of 1 to 5.