Thermodynamic temperature is a base dimension in the International System of Units.  The SI unit of thermodynamic temperature is the kelvin, defined as the fraction $\frac{1}{273.16}$ of the thermodynamic temperature of the triple point of water (13th CGPM, 1967).

It is often more convenient to represent empirical temperatures using Temperature objects, rather than expressions with a unit. For example, such objects can represent a temperature with value 0, whereas expressions with a unit cannot.

Maple knows the units of temperature listed in the following table.

An asterisk ( * ) indicates the default context, an at sign (@) indicates an abbreviation, and under the prefixes column, SI indicates that the unit takes all SI prefixes, IEC indicates that the unit takes IEC prefixes, and SI+ and SI- indicate that the unit takes only positive and negative SI prefixes, respectively.  Refer to a unit in the Units package by indexing the name or symbol with the context, for example, kelvin[SI] or deg[Celsius]; by using an abbreviation, for example, degC or Celsius; or, if the context is indicated as the default, by using only the unit name or symbol, for example, kelvin.

Note: The default context of the degree is angle, relating to a measurement of angle not temperature.

To convert absolute temperatures, for example, to convert 0 degrees Celsius to 32 degrees Fahrenheit, use the conversion routine convert/temperature.

To convert temperature intervals, for example, to convert an increase of 5 kelvin to an increase of 5 degrees Celsius, use the conversion routine convert/units.

The units of thermodynamic temperature are defined as follows.

A degree Celsius is defined as $1$ kelvin.

A degree Rankine is defined as $\frac{5}{9}$ kelvin.

A degree Fahrenheit is defined as $\frac{5}{9}$ kelvin.

A degree centigrade is defined as $\frac{1}{100}$ of the thermodynamic temperature interval between the freezing and boiling points of water at standard pressure.  It is approximately equal to $0.99975$ kelvin.

A degree Reaumur is defined as $\frac{1}{80}$ of the thermodynamic temperature interval between the freezing and boiling points of water at standard pressure.  It is approximately equal to $0.7998$ kelvin.

A planck temperature is defined as the square root of: the planck constant times the speed of light to the fifth power, divided by twice $\mathrm{\pi }$ times the Newtonian gravitational constant times the Boltzmann constant.

$\mathrm{convert}\left('\mathrm{kelvin}'\,'\mathrm{dimensions}'\,'\mathrm{base}'=\mathrm{true}\right)$

$\mathrm{thermodynamic\_temperature}$

$\mathrm{convert}\left(10\,'\mathrm{units}'\,'\mathrm{degF}'\,'\mathrm{degC}'\right)$

$\frac{50}{9}$

$\mathrm{convert}\left(10\,'\mathrm{temperature}'\,'\mathrm{degF}'\,'\mathrm{degC}'\right)$

$-\frac{110}{9}$

$\mathrm{convert}\left(10\,'\mathrm{units}'\,'\mathrm{degR}'\,'\mathrm{kelvin}'\right)$

$\frac{50}{9}$

$\mathrm{convert}\left(10\,'\mathrm{temperature}'\,'\mathrm{degR}'\,'\mathrm{kelvin}'\right)$

$\frac{50}{9}$

$\mathrm{convert}\left(23.325\,'\mathrm{units}'\,'\mathrm{degF}'\,'\mathrm{kelvin}'\right)$

$12.95833333$

$\mathrm{convert}\left(23.325\,'\mathrm{temperature}'\,'\mathrm{degF}'\,'\mathrm{kelvin}'\right)$

$268.3305555$