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A convenient operational definition of '''temperature''' is that it is a measure of the average translational kinetic energy associated with the disordered microscopic motion of atoms and molecules.<ref>http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/temper.html</ref>  

A convenient operational definition of '''temperature''' is that it is a measure of the average translational kinetic energy associated with the disordered microscopic motion of atoms and molecules.<ref>http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/temper.html</ref>  

Temperature is expressed in degrees. There are two units of temperature in common use - [[Celsius degree|Celsius]] (°C) and [[Fahrenheit degree|Fahrenheit]] (°F). Both make reference to the freezing and boiling points of pure water at normal atmospheric pressure.   

Temperature is expressed in degrees. There are two units of temperature in common use - [[Celsius degree|Celsius]] (°C) and [[Fahrenheit degree|Fahrenheit]] (°F). Both make reference to the freezing and boiling points of pure water at normal [[atmospheric pressure]].   

Celsius (sometimes known as centigrade in the past) sets the freezing point at 0 degrees (0&nbsp;°C) and the boiling point at 100 degrees (100&nbsp;°C).<br>

Celsius (sometimes known as centigrade in the past) sets the freezing point at 0 degrees (0&nbsp;°C) and the boiling point at 100 degrees (100&nbsp;°C).<br>