Celsius (°C) is the most widely used temperature scale in the world. It is named after the Swedish astronomer Anders Celsius, who introduced it in 1742.
The Celsius scale—also known as centigrade—is based on the freezing and boiling points of water at standard atmospheric pressure. Water freezes at 0°C and boils at 100°C, creating 100 equal degrees between these two reference points.
Celsius is commonly used in weather reporting, heating and air conditioning systems, and scientific applications.
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