What is the temperature scale whose absolute zero is 0 kelvins?

The temperature scale whose absolute zero is 0 kelvins is the Kelvin scale.

The kelvin is the SI base unit of thermodynamic temperature. Its zero point, absolute zero, is the theoretical lowest possible temperature, where a system has its minimum thermal energy. Kelvin temperatures do not use a degree symbol: scientists write 273.15 K, not 273.15°K.

The size of one kelvin is the same as one degree Celsius. Consequently, 0 °C equals 273.15 K, and a temperature difference of 10 °C has the same size as a difference of 10 K. The Kelvin scale is especially useful in atmospheric science, thermodynamics, and physics because many equations require absolute temperature.

Absolute zero cannot be reached exactly in practice, although laboratory techniques can approach it extremely closely. The scale is named after William Thomson, later Lord Kelvin, whose work helped establish the concept of an absolute temperature scale. Weather forecasts usually use Celsius or Fahrenheit, while scientific calculations often use kelvins.