Temperature scale

Temperature scale


All temperature scales are
based on some easily reproducible states such as the freezing and boiling point
of water, which are also called the ice-point
and the steam-point respectively.


A mixture of ice and water that is in equilibrium with air saturated
with water vapour at 1atm pressure is said to be at the ice-point, and a
mixture of liquid water and water vapour (with no air) in equilibrium at 1atm
is said to be at the steam-point.


Celsius and Fahrenheit
scales are based on these two points (although the value assigned to these two
values is different) and are referred as two-point scales.


In thermodynamics, it is very desirable to have a
temperature scale that is independent of the properties of the substance or
substances.

Such
a temperature scale is called a thermodynamic
temperature scale
.(Kelvin in SI)

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