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Physics Formulas

Celsius Formula

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: The boiling point is the temperature at which a substance changes its state from a liquid to a gas (boils).

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

Freezing Point: The Freezing point is the temperature at which substance changes its state from a liquid to a solid. In the case of mixtures, the freezing point is lower than the melting point.

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

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

Kelvin: Kelvin 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 273.15°K and the boiling point of water is 373.15°K measured at sea 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= \( frac{9}{5}× C+32\)


F Fahrenheit
C Celsius

Fahrenheit to Celsius Conversion Formula

T(°C) = (T(°F) – 32) × \(\frac{5}{9} \)


T(°C) =  (T(°F) – 32) / (9/5)


T(°C) = (T(°F) – 32)  / ( 1.8)


T(°F) Fahrenheit temperature
T(°C) Celsius temperature

Kelvin to Celsius Conversion Formula

C = K – 273


K Kelvin
C Celsius

Solved Examples

Q 1: Convert temperatures 30° Celsius to Fahrenheit.


Celsius = 30°

Formula: F= \(\frac{9}{5}× C+32 \)

F = 30°×\(\frac{9}{5}+32 \)

F= 6 × 9+32

F= 54 + 32

F = 86° F

Q.2. Convert temperature 300 Kelvin to Celsius ?


Given, K= 300 K

Formula: C=K-273

T(°C) = 300K – 273.15 = 26.85 °C

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


Given, F= 68°F

Formula: T(°C) = (T(°F) – 32) × \(\frac{5}{9} \)

T(°C) = (68°F – 32) × \(\frac{5}{9} \)

T(°C) = 36 × \(\frac{5}{9} \)

T(°C) = 4 × 5

T(°C)= 20 °C

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