Which temperature scale is predominantly used worldwide?

The Celsius scale is predominantly used worldwide due to its alignment with the metric system and its practicality for common temperature measurements. It is a decimal-based scale where 0 degrees Celsius represents the freezing point of water and 100 degrees Celsius represents the boiling point at standard atmospheric pressure. This makes it intuitive for most people, especially in scientific, educational, and everyday contexts, as it directly relates to the state changes of water, a crucial element in many natural and industrial processes.

Most countries have adopted the Celsius scale for daily weather reporting, scientific research, and educational purposes, which contributes to its global prominence. Other temperature scales, while important in specific contexts—such as Fahrenheit in the United States for weather reporting or Kelvin in scientific contexts for thermodynamic calculations—are not as widely used in general applications worldwide as Celsius.