The Absolute Temperature Scale (Kelvin) establishes a thermodynamic temperature measurement system anchored at absolute zero, defined strictly by thermodynamic properties rather than phase transitions of specific substances. It utilizes the symbol $K$ as its unit without numerical prefixes to denote magnitude relative to the third law of thermodynamics, which posits that entropy approaches a constant value as thermal motion ceases entirely. This scale serves as the foundational coordinate for all equations in classical and statistical mechanics within physics and chemistry where temperature must be treated as an additive quantity proportional to average kinetic energy per particle.
Prerequisite chain context: requires Ideal Gas Law in Thermodynamics.