The Kelvin scale is a temperature scale used primarily in scientific contexts. It starts at absolute zero, which is the point where all molecular motion ceases, defined as 0 K. Each increment on the Kelvin scale is equivalent to one degree Celsius, making it easy to convert between the two scales. Unlike the Celsius and Fahrenheit scales, the Kelvin scale does not use negative numbers. This makes it particularly useful in fields like physics and engineering, where precise temperature measurements are crucial. The Kelvin scale is named after the Scottish physicist William Thomson, 1st Baron Kelvin, who contributed significantly to thermodynamics.