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The Celsius scale is based on the freezing point (0°C) and boiling point (100°C) of water. It's widely used around the world.
The Fahrenheit scale defines the freezing point of water at 32°F and the boiling point at 212°F. Primarily used in the United States.
The Kelvin scale is an absolute thermodynamic temperature scale. 0 K (absolute zero) is the point where molecular motion ceases. It's used in scientific contexts.