What temperature scale represents freezing point at 0 degrees?

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

Answer: (A)

The Celsius scale is the temperature scale that represents the freezing point of water at 0 degrees. This scale is based on the properties of water, where the freezing point is defined as the temperature at which water changes from a liquid to a solid. It is widely used in scientific contexts and everyday life in most countries around the world.

In contrast, the Fahrenheit scale represents the freezing point of water at 32 degrees. The Kelvin scale, which is used in scientific measurements, defines absolute zero and has the freezing point of water at 273.15 K. The Rankine scale, primarily used in engineering and thermodynamics, aligns with the Kelvin scale but uses Fahrenheit units, marking the freezing point of water at 491.67 R. Thus, the Celsius scale is unique in setting the freezing point at 0 degrees, making it the correct choice.