# Temperature Converter

## Scale of Temperature

**Scale of temperature** is a methodology of calibrating the physical quantity temperature in metrology. **Empirical scales** measure temperature in relation to convenient and stable parameters, such as the freezing and boiling point of water. Absolute temperature is based on thermodynamic principles: using the lowest possible temperature as the zero point, and selecting a convenient incremental unit. **Celsius**, **Kelvin**, and **Fahrenheit** are common temperature scales. Other scales used throughout history include Rankine, Rømer, Newton, Delisle, Réaumur, Gas Mark, Leiden and Wedgwood.

## What does temperature converter do?

**Temperature Converter** is a free online temperature converter to instantly converts scale of temperature. **Degrees** of Fahrenheit (°F), Celsius (°C), Kelvin (K), Rankine (°R), Delisle (°D).

## What is Empirical Scales?

Empirical scales are based on the measurement of physical parameters that express the property of interest to be measured through some formal, most commonly a simple linear, functional relationship. For the measurement of temperature, the formal definition of thermal equilibrium in terms of the thermodynamic coordinate spaces of thermodynamic systems, expressed in the zeroth law of thermodynamics, provides the framework to measure temperature.

## What is Celsius Scale?

Celsius (known until 1948 as centigrade) is a temperature scale that is named after the Swedish astronomer Anders Celsius (1701–1744), who developed a similar temperature scale two years before his death. The degree Celsius (°C) can refer to a specific temperature on the Celsius scale as well as a unit to indicate a temperature interval (a difference between two temperatures or an uncertainty).

## What is Thermodynamic Scale?

Thermodynamic Scale differs from empirical scales in that it is absolute. It is based on the fundamental laws of thermodynamics or statistical mechanics instead of some arbitrary chosen working material. Besides it covers full range of temperature and has simple relation with microscopic quantities like the average kinetic energy of particles (see equipartition theorem). In experiments ITS-90 is used to approximate thermodynamic scale due to simpler realization.

## Examples

Unit | Water Freezing Point |
---|---|

Fahrenheit | 32 °F |

Celsius | 0 °C |

Kelvin | 273 K |

Rankine | 491 °R |

Delisle | 150 °De |