Final answer:
The Kelvin scale is the temperature scale without negative values because it starts at absolute zero, where all temperatures are positive.
Step-by-step explanation:
The temperature scale that does not possess negative values is the Kelvin scale. In contrast to the Fahrenheit and Celsius scales, which are relative temperature scales, the Kelvin scale is an absolute temperature scale. It begins at zero, which represents the lowest possible temperature, known as absolute zero; the point at which there is no molecular motion. Thus, by its nature, the Kelvin scale does not include negative numbers, and all temperatures are positive values. The kelvin, abbreviated as 'K', is the official unit of the Kelvin scale and does not include the degree symbol. The Kelvin scale is essential in scientific work because many physical properties, including the volume of an ideal gas, relate directly to absolute temperature.