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Centigrade temperature scale

The Celsius or centigrade temperature scale is the most common temperature scale in everyday use today, although in the US the Fahrenheit scale is more common.

The expected air temperature in the weather forecast is normally given in degrees Celsius or $$^{\circ}\text{C}.$$

The centigrade scale was originally defined using two fixed points:

  • Steam point - The boiling point of pure water at one atmospheric pressure ($$100^{\circ}\text{C}$$)
  • Ice point - The melting point of pure ice at one atmospheric pressure ($$0^{\circ}\text{C}$$)

These two reference points can be used to define any temperature.

The air temperature during one afternoon in July is $$30 ^{\circ}\text{C}.$$

Nowadays, two different fixed points are used to fix the centigrade scale more precisely.

The boiling point of water was used to define the Celsius temperature scale.
The boiling point of water was used to define the Celsius temperature scale.