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# Temperature scales

A temperature scale is a way of assigning a numerical value to a particular temperature.

This is similar to the length scale on a ruler (e.g. in inches or centimetres) in the measurement of length.

A temperature scale needs to be calibrated (marked so that it can be used in different situations) using at least two fixed points.

A fixed point is a standard known temperature like the boiling point of pure water.

Temperature scales can have different zero values and unit (interval) values.

The Celsius and Fahrenheit scales have different zero values $(0^{\circ}\text{C}=32^{\circ}\text{F})$ and different interval values. An interval of $1^{\circ}\text{F}$ is equal to an interval of $5/9^{\circ}\text{C}.$

Two thermometers calibrated according to the Celsius scale and the Fahrenheit scale.