# Temperature Converter

**7 Feb 2024**

## Table of Contents

## Definition of Temperature

Temperature is a fundamental concept in the field of thermodynamics, measuring the intensity of heat or coldness in a given object or environment. It plays a crucial role in scientific, industrial, and everyday applications.

However, different regions of the world have adopted various temperature scales. To bridge this gap and facilitate temperature conversion, a temperature converter tool becomes an invaluable asset.

## Temperature Units

In this article, we will explore the most commonly used temperature units, their definitions, and provide conversion factors for each, empowering you to effortlessly convert between Celsius, Fahrenheit, Kelvin, Rankine, Delisle, Newton, Réaumur, and Rømer.

### Celsius (°C)

The Celsius scale, also known as the centigrade scale, is widely used in most parts of the world. It defines the freezing point of water at 0°C and the boiling point at 100°C, under standard atmospheric pressure.

**Conversion Factors:**

- Celsius to Fahrenheit:
`°F = °C * 9/5 + 32`

- Celsius to Kelvin:
`K = °C + 273.15`

- Celsius to Rankine:
`°R = °C * 9/5 + 32 + 459.67`

- Celsius to Delisle:
`°De = (100 - °C) * 3/2`

- Celsius to Newton:
`°N = °C * 33/100`

- Celsius to Réaumur:
`°Ré = °C * 0.8`

- Celsius to Rømer:
`°Rø = °C * 21/40 + 7.5`

### Fahrenheit (°F)

The Fahrenheit scale is commonly used in the United States, and some other countries. It sets the freezing point of water at 32°F and the boiling point at 212°F, under standard atmospheric pressure.

**Conversion Factors:**

- Fahrenheit to Celsius:
`°C = (°F - 32) * 5/9`

- Fahrenheit to Kelvin:
`K = (°F - 32) * 5/9 + 273.15`

- Fahrenheit to Rankine:
`°R = °F + 459.67`

- Fahrenheit to Delisle:
`°De = (212 - °F) * 5/6`

- Fahrenheit to Newton:
`°N = (°F - 32) * 11/60`

- Fahrenheit to Réaumur:
`°Ré = (°F - 32) * 4/9`

- Fahrenheit to Rømer:
`°Rø = (°F - 32) * 7/24 + 7.5`

### Kelvin (K)

The Kelvin scale is the SI unit of temperature and is commonly used in scientific and engineering applications. It is based on the absolute zero, the theoretical point at which all molecular motion ceases, defined as 0 Kelvin (-273.15°C).

**Conversion Factors:**

- Kelvin to Celsius:
`°C = K - 273.15`

- Kelvin to Fahrenheit:
`°F = (K - 273.15) * 9/5 + 32`

- Kelvin to Rankine:
`°R = K * 9/5`

- Kelvin to Delisle:
`°De = (373.15 - K) * 3/2`

- Kelvin to Newton:
`°N = (K - 273.15) * 33/100`

- Kelvin to Réaumur:
`°Ré = (K - 273.15) * 4/5`

- Kelvin to Rømer:
`°Rø = (K - 273.15) * 21/40 + 7.5`

### Rankine (°R)

The Rankine scale is primarily used in engineering, especially in the United States, and is based on the Fahrenheit scale. Absolute zero is defined as 0 Rankine.

**Conversion Factors:**

- Rankine to Celsius:
`°C = (°R - 491.67) * 5/9`

- Rankine to Fahrenheit:
`°F = °R - 459.67`

- Rankine to Kelvin:
`K = °R * 5/9`

- Rankine to Delisle:
`°De = (671.67 - °R) * 5/6`

- Rankine to Newton:
`°N = (°R - 491.67) * 11/60`

- Rankine to Réaumur:
`°Ré = (°R - 491.67) * 4/9`

- Rankine to Rømer:
`°Rø = (°R - 491.67) * 7/24 + 7.5`

### Delisle (°De)

The Delisle scale was developed by Joseph-Nicolas Delisle, a French astronomer. It is based on the concept of "reversed Celsius", where the boiling point of water is 0°De, and the freezing point is 150°De.

**Conversion Factors:**

- Delisle to Celsius:
`°C = 100 - (°De * 2/3)`

- Delisle to Fahrenheit:
`°F = 212 - (°De * 6/5)`

- Delisle to Kelvin:
`K = 373.15 - (°De * 2/3)`

- Delisle to Rankine:
`°R = 671.67 - (°De * 6/5)`

- Delisle to Newton:
`°N = 33 - °De * 11/50`

- Delisle to Réaumur:
`°Ré = 80 - °De * 8/15`

- Delisle to Rømer:
`°Rø = 60 - °De * 7/20`

### Newton (°N)

The Newton scale, proposed by Sir Isaac Newton, is based on dividing the range between the freezing and boiling points of water into 33 equal parts.

**Conversion Factors:**

- Newton to Celsius:
`°C = °N * 100/33`

- Newton to Fahrenheit:
`°F = °N * 60/11 + 32`

- Newton to Kelvin:
`K = °N * 100/33 + 273.15`

- Newton to Rankine:
`°R = °N * 60/11 + 491.67`

- Newton to Delisle:
`°De = (33 - °N) * 50/11`

- Newton to Réaumur:
`°Ré = °N * 80/33`

- Newton to Rømer:
`°Rø = °N * 35/22 + 7.5`

### Réaumur (°Ré)

The Réaumur scale, developed by René Antoine Ferchault de Réaumur, sets the freezing point of water at 0°Ré and the boiling point at 80°Ré.

**Conversion Factors:**

- Réaumur to Celsius:
`°C = °Ré * 5/4`

- Réaumur to Fahrenheit:
`°F = °Ré * 9/4 + 32`

- Réaumur to Kelvin:
`K = °Ré * 5/4 + 273.15`

- Réaumur to Rankine:
`°R = °Ré * 9/4 + 491.67`

- Réaumur to Delisle:
`°De = (80 - °Ré) * 15/8`

- Réaumur to Newton:
`°N = °Ré * 33/80`

- Réaumur to Rømer:
`°Rø = (°Ré * 21/32) + 7.5`

### Rømer (°Rø)

The Rømer scale, developed by Ole Rømer, a Danish astronomer, sets the freezing point of water at 7.5°Rø and the boiling point at 60°Rø.

Conversion Factors:

- Rømer to Celsius:
`°C = (°Rø - 7.5) * 40/21`

- Rømer to Fahrenheit:
`°F = (°Rø - 7.5) * 24/7 + 32`

- Rømer to Kelvin:
`K = (°Rø - 7.5) * 40/21 + 273.15`

- Rømer to Rankine:
`°R = (°Rø - 7.5) * 24/7 + 491.67`

- Rømer to Delisle:
`°De = (60 - °Rø) * 20/7`

- Rømer to Newton:
`°N = (°Rø - 7.5) * 22/35`

- Rømer to Réaumur:
`°Ré = (°Rø - 7.5) * 32/21`