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In the United States, the lay person uses the Farenheit scale for temperature, where water freezes at 32°F and boils at 212°F. The rest of the world, as well as scientists and engineers in the United States, use the Celsius (old name is centigrade) scale for temperature, where water freezes at 0°C and boils at 100°C. The Celsius scale is part of the metric system.

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See: Fahrenheit and Celsius Temperature Scales