Which temperature scale uses the absolute zero point as its starting point?

The Kelvin scale is the temperature scale that utilizes absolute zero as its starting point. Absolute zero is defined as the theoretical temperature at which a system has minimal thermal energy, corresponding to 0 Kelvin. This means that all molecular motion stops in a perfect crystal at this temperature. The Kelvin scale is an absolute scale, meaning it does not have negative values, and it is widely used in science and engineering, particularly in thermodynamics and physical sciences, for calculations involving temperature.

The Celsius and Fahrenheit scales are relative temperature scales, meaning they are based on defined reference points rather than absolute zero. Celsius sets the freezing and boiling points of water as its key reference points, while Fahrenheit uses different fixed points based on the mixture of ice and salt as well as human body temperature. The Rankine scale, similar to the Kelvin scale, is also an absolute temperature scale, but it is primarily used in certain engineering fields, especially in the United States, with its increments equivalent to Fahrenheit degrees. However, it begins at absolute zero, making Kelvin the more universally recognized standard ahmong scientists.