Temperature & Heat: Temperature

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Temperature

Measure of the hotness or coldness of a body

Scalar quantity

Units

SI unit - Kelvin (K)

Degree Celsius (ºC)

Both units are the same size and there is a fixed relationship between them

Celsius scale

The two fixed points are the melting point of pure ice and the boiling point of pure water at atmospheric pressure

This interval is divided into 100 equal parts

Kelvin scale

The two fixed points are absolute zero and 0 ºC

Interval is the same size as the degree Celsius

0 K = -273.15 ºC

Thermometric Property

A physical property that changes measurably with temperature

Length of liquid column (e.g. thermometer)

Emf of thermocouple

Pressure of gas at constant volume

Volume of gas at constant pressure

Resistance

Colour

Calibration Curve

A graph of the thermometric property against temperature, measures with the laboratory standard thermometer

The new thermometer can be used by noting the value of the thermometric property at an unknown temperature

The graph is then used to find the corresponding temperature

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