The standard SI unit for measuring temperature is the kelvin (K). The kelvin scale is an absolute temperature scale used in scientific contexts, where 0 K represents absolute zero, the theoretical point at which molecular motion ceases. A temperature difference of one kelvin is equivalent to a difference of one degree Celsius, making conversions between these units straightforward. In many everyday scenarios, Celsius (°C) is more commonly used, but kelvin is crucial in fields like physics, chemistry, and thermodynamics for precise temperature measurements.