What is the SI unit for temperature?

The SI unit for temperature is the Kelvin. The Kelvin scale is an absolute temperature scale used widely in scientific contexts because it starts at absolute zero, the point at which molecular motion ceases. This makes it particularly useful in thermodynamics and other areas of physics and chemistry where precise measurements are essential.

Celsius and Fahrenheit are both temperature scales commonly used in daily life but are not part of the International System of Units (SI). Celsius is often used in most of the world for everyday temperature measurements, while Fahrenheit is mainly used in the United States. Rankine, like Fahrenheit, is mainly used in certain engineering fields, particularly those involving thermodynamics, but it is also not an SI unit.

In conclusion, the Kelvin is the standard scientific unit for temperature, providing a universal scale that is crucial for scientific calculations and comparisons.