kelvin/watt [K/W] Unit Converter

Definition of kelvin/watt [K/W] unit

Kelvin per watt (K/W) is the SI-derived unit of thermal resistance, expressing the temperature difference, in kelvins, required to produce a heat-transfer rate of one watt through a component or material.

History of kelvin/watt [K/W] unit

The kelvin per watt emerged with thermal engineering and the adoption of the International System of Units (SI). It combines the kelvin, named after physicist William Thomson, Lord Kelvin, with the watt, honoring engineer James Watt. As heat-flow analysis became standardized during the nineteenth and twentieth centuries, engineers needed a consistent measure for resistance to heat transfer. The unit became important in electronics, building science, and materials research, where temperature rise is related directly to dissipated power. It is the reciprocal counterpart of thermal conductance, measured in watts per kelvin.

Applications of kelvin/watt [K/W] unit

Today, K/W is used to specify the thermal resistance of electronic packages, heat sinks, insulation, pipes, and building assemblies. Engineers use it to estimate temperature rise from known power dissipation: a component rated at 2 K/W rises 20 K when dissipating 10 W, assuming steady-state conditions. Lower values indicate better heat removal.

Complete list of kelvin/watt [K/W] unit conversion