The temperature in Kelvin is a unit of measurement used in science to express absolute temperature. It is part of the International System of Units (SI) and is based on the absolute zero point, where all molecular motion stops. The Kelvin scale starts at 0 K, which is equivalent to -273.15 °C. One Kelvin is equal to one degree Celsius, making it easy to convert between the two scales. To convert Celsius to Kelvin, simply add 273.15. The Kelvin scale is commonly used in fields like physics, chemistry, and engineering for precise temperature measurements.