Which temperature scale starts at absolute zero?

• A. Celsius Scale
• B. Fahrenheit Scale
• C. Kelvin Scale
• D. Rankine Scale

Answer: (C)

The Kelvin scale is significant because it is an absolute temperature scale, meaning it starts at absolute zero, which is defined as 0 Kelvin (K). Absolute zero represents the point at which all molecular motion ceases, making it a fundamental reference point in thermodynamics and physics. The Kelvin scale is widely used in scientific contexts, particularly when dealing with thermodynamic calculations and laws, as it provides a clear, absolute measurement of temperature without the negative values found in other scales like Celsius and Fahrenheit.

Both the Celsius and Fahrenheit scales are relative temperature scales that are based on the properties of water, where they measure temperatures above certain reference points (freezing and boiling of water) but do not have absolute zero as their starting point. The Rankine scale, while it also relates to thermodynamic temperatures, is based on the Fahrenheit scale and starts at absolute zero but is less commonly used than the Kelvin scale in scientific fields.