Temperature is the degree of heat of a person or an object. Celsius scale is commonly used to represent temperature scale. Originally centigrade is the name of the Celsius temperature scale and renamed after the Swedish astronomer Anders Celsius. Let us study the Celsius formula in detail.

**Celsius Formula**

**Measurement of Temperature**

The degree or intensity of heat present in a substance or object is known as temperature. Temperature is used to express the heat of a body according to a comparative scale. Temperature is measured by a thermometer or perceived by touch. The temperature of an object is measured by different scales they are Celsius, Fahrenheit, Kelvin.

**Boiling Point:** TheÂ boiling pointÂ is theÂ temperatureÂ at which a substance changes its state from a liquid to a gas (boils).

**Melting Point:** TemperatureÂ at which a substance changes its state from a solid to a liquid is called melting point. At theÂ melting point, there is equilibrium in the solid phase and liquid phase of a substance.

**Freezing Point:**Â The Freezing point is the temperatureÂ at which substance changes its state from a liquid to a solid. In the case of mixtures, theÂ freezing pointÂ is lower than the meltingÂ point.

**Celsius:** CelsiusÂ temperature scale is the scale used to measure temperature more often. TheÂ CelsiusÂ temperature scale is divided into 100 equal parts, called degreesÂ CelsiusÂ (Â°C), between the freezing point and boiling point of water. In the Celsius scale, the freezing point of water is 0Â°Â C and boiling point of water is 100Â°Â C.

**Fahrenheit: **In the United States (and its associated territories) and byÂ several nations in the Caribbean for measuring temperature commonly used scale, which is FahrenheitÂ temperature scale. In the Fahrenheit temperature scale, the freezing point of water is 32Â°F and the boiling point of water is 212Â°F measured at seaÂ level.

**Kelvin:** KelvinÂ temperature scale is the scale used to measure temperature. Kelvin is the base unit of temperature in the International System of Units that is equal to \(\frac{1}{273.16}\) of the Celsius scale temperature. \(\frac{1}{273.16}\) is considered as the triple point of water. In the Kelvin temperature scale, the freezing point of water is 273.15Â°K and the boiling point of water is 373.15Â°K measured at seaÂ level.

### There are four conversions of Temperatures

- Celsius to Fahrenheit Conversion
- Fahrenheit to Celsius Conversion
- Kelvin to Celsius
- Celsius to Kelvin

**Celsius to Fahrenheit Conversion Formula**

F= \( frac{9}{5}Ã— C+32\)

Where,

F | Fahrenheit |

C | Celsius |

**Fahrenheit to Celsius Conversion Formula**

T_{(Â°C)}Â = (T_{(Â°F)}Â – 32) Ã— \(\frac{5}{9} \)

or

T_{(Â°C)}Â =Â (T_{(Â°F)}Â – 32) / (9/5)

or

T_{(Â°C)}Â = (T_{(Â°F)}Â – 32)Â / ( 1.8)

Where,

T_{(Â°F)} |
Fahrenheit temperature |

T_{(Â°C)} |
Celsius temperature |

**Kelvin to Celsius Conversion Formula**

C = K – 273

Where,

K | Kelvin |

C | Celsius |

**Solved Examples**

QÂ 1:Â Convert temperatures 30Â°Â Celsius to Fahrenheit.

Solution:

Given,

Celsius = 30Â°

Formula:Â F= \(\frac{9}{5}Ã— C+32 \)

FÂ = 30Â°Ã—\(\frac{9}{5}+32 \)

F= 6 Ã— 9+32

F= 54 + 32

FÂ =Â 86Â° F

Q.2. Convert temperature 300 Kelvin to Celsius ?

Solution:

Given, K= 300 K

Formula: C=K-273

T_{(Â°C)}Â = 300K – 273.15 = 26.85 Â°C

Q.3. Convert temperature 68Â° Fahrenheit to Celsius?

Solution:

Given, F= 68Â°F

Formula: T_{(Â°C)}Â = (T_{(Â°F)}Â – 32) Ã— \(\frac{5}{9} \)

T_{(Â°C)}Â = (68Â°F – 32) Ã— \(\frac{5}{9} \)

T_{(Â°C)} = 36 Ã— \(\frac{5}{9} \)

T_{(Â°C)} = 4 Ã— 5

T_{(Â°C)}= 20 Â°C

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