Kelvin

The Kelvin scale was introduced in 1848 by Scottish physicist and engineer William Thomson, 1st Baron Kelvin. It is primarily used in science, engineering, and physics as an absolute temperature reference, ensuring consistency in thermodynamic equations.

As the standard unit of temperature, Kelvin is essential in physics, chemistry, and engineering, where precise thermal measurements are crucial. Unlike everyday temperature scales such as Celsius and Fahrenheit, which are based on water’s freezing and boiling points, Kelvin is anchored to absolute zero (0 K)—the theoretical point where all molecular motion ceases.

Because the Kelvin scale begins at absolute zero, it has no negative values—all temperatures are positive. It shares the same increments as Celsius (1 K = 1°C change) but omits the degree symbol (°), distinguishing it from other temperature scales.