Kelvinmåling

Kelvinmåling refers to the process of measuring temperature using the Kelvin scale. The Kelvin scale, symbolized by K, is the base unit of thermodynamic temperature in the International System of Units (SI). It is an absolute temperature scale, meaning that zero Kelvin (0 K) represents absolute zero, the theoretical point at which particles have minimal motion. This differs from Celsius and Fahrenheit, which have arbitrary zero points.

The definition of the Kelvin scale is based on the Boltzmann constant, a fundamental constant in physics. One kelvin is defined as the change in thermodynamic temperature that results in a change of the fundamental unit of energy, the joule, by 1.317064 × 10⁻²³ J. This makes the Kelvin scale directly proportional to the average kinetic energy of the particles in a system.

Measurements in Kelvin are crucial in many scientific fields, including thermodynamics, statistical mechanics, and cryogenics. Converting between Kelvin and Celsius is straightforward: K = °C + 273.15. For example, the freezing point of water is 0°C, which is equivalent to 273.15 K, and the boiling point of water is 100°C, or 373.15 K. Kelvinmåling ensures a consistent and scientifically accurate representation of thermal energy.