Which of the following is not a temperature scale?

The Rankine scale, while sometimes used in engineering and certain scientific applications, is indeed a temperature scale. It is an absolute temperature scale that uses the same incremental measurement as Fahrenheit but starts at absolute zero. However, the question asks for a choice that is not a temperature scale, suggesting that the correct answer in this context is the selection that is indeed a temperature scale, hence every option presented (Fahrenheit, Celsius, Kelvin, and Rankine) is a recognized temperature scale. Therefore, a more suitable answer should reflect that there is no option given that is not a temperature scale.

In reviewing the definitions of each provided scale, Fahrenheit measures temperature in relation to the freezing and boiling points of water, Celsius does the same in metric terms, Kelvin is based on the absolute temperature system starting from absolute zero, and Rankine also measures absolute temperature but from the Fahrenheit perspective. Each one is a legitimate temperature measurement system. Understanding all four scales can provide valuable insights into various scientific contexts, especially in fields related to meteorology and climate studies.