The Kelvin temperature scale is different from the Celsius and Fahrenheit temperature scales because: a) Kelvin temperature is always a positive value. b) Kelvin temperature is only negative at extremely low temperatures. c) Kelvin temperature is only

The correct answer is option (a) - Kelvin temperature is always a positive value. This is because the Kelvin scale is an absolute temperature scale where zero is defined as absolute zero, the lowest possible temperature where all thermal motion ceases. Therefore, any temperature above absolute zero will be a positive value on the Kelvin scale. In contrast, the Celsius and Fahrenheit scales use the freezing and boiling points of water as reference points for their scales, resulting in negative values for temperatures below freezing.