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Kelvin and Celsius are the two commonly used scales for measuring temperatures. Kelvin scale is used by scientists and engineers, while the Celsius scale is used by over 90% of the people in the world.
- The Celsius scale defines the freezing-point temperature as 0 ∘C and the steam-point temperature as 100 ∘C.
- The Kelvin scale is the scale of temperature whose zero coincides with -273.15 ∘C.
- This scale is also known as the Absolute scale.
- To convert Kelvin to Celsius, one of the simplest methods is to subtract 273.15 from the Kelvin temperature to obtain the required Celsius temperature.
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Key Terms: Temperature, Celsius scale, Absolute zero, Kelvin scale, Absolute scale, Kelvin to Celsius conversion, Celsius to Kelvin conversion
How to Convert Kelvin Temperature to Celsius Temperature?
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The conversion of Kelvin to Celsius can be done by subtracting 273.15 from the Kelvin temperature to obtain the required Celsius temperature. The relation between the Kelvin scale and the Celsius scale is given by the formula
| C = K - 273.15 |
The above relation is known as the Kelvin to Celsius conversion formula.
Similarly, we can also write
| K = C + 273.15 |
The above relation is known as the Celsius to Kelvin conversion formula.
Where
- C refers to the magnitude of temperature in degrees Celsius
- K refers to the magnitude of temperature in Kelvin
Conversion of Kelvin to Celsius Scale
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| Related Links | ||
|---|---|---|
| Temperature Formula | Fahrenheit to Celsius Formula | Unit of Temperature |
| Celsius Scale | Pseudo First Order Reaction | Relation between Celsius and Fahrenheit |
Solved Examples
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| Ques. Convert the boiling point of water i.e. 100 ∘C to Kelvin. Ans. The formula of Celsius to Kelvin is given by K = C + 273.15 We have the boiling point of water in degrees Celsius, C = 100 ∘C On substituting the value, we get K = 100 + 273.15 ⇒ K = 373.15 K Hence, the triple point of water on the Kelvin scale is 373.15 K. Ques. Convert the freezing point of water i.e. 0 ∘C to Kelvin. Ans. The Celsius to Kelvin formula is given by K = C + 273.15 We have, the freezing point of water in degrees Celsius, C = 0 ∘C On substituting the value, we get K = 0 + 273.15 ⇒ K = 273.15 K Hence, the freezing point of water on the Kelvin scale is 373.15 K. Ques. Convert 550 K to Celsius. Ans. The Kelvin to Celsius formula is given by C = K - 273.15 We have, K = 550 K On substituting the value, we get C = 550 - 273.15 ⇒ C = 276.85 ∘C Therefore, 550 K = 276.85 ∘C Ques. Convert 700 K to Celsius. Ans. The Kelvin to Celsius formula is given by C = K - 273.15 We have, K = 700 K On substituting the value, we get C = 700 - 273.15 ⇒ C = 426.85 ∘C Therefore, 700 K = 426.85 ∘C |
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Things to Remember
- The unit of temperature in the Celsius scale is represented as degrees Celsius (∘C).
- The unit of temperature in the Kelvin scale is represented as Kelvin (K).
- In the Celsius scale, the ice-point temperature is given as 0 ∘C and the steam-point temperature is given as 100 ∘C.
- The zero of the Kelvin scale of temperature coincides with -273.15 ∘C.
- To convert Celsius to Kelvin, we use the formula K = C + 273.15.
- To convert Kelvin to Celsius, we use the formula C = K - 273.15
Sample Questions
Ques. Convert the triple point of water i.e. 0.01 ∘C to Kelvin. (2 Marks)
Ans. The formula of Celsius to Kelvin is given by
K = C + 273.15
We have the triple point of water in degrees Celsius, C = 0.01 ∘C
On substituting the value, we get
K = 0.01 + 273.15
⇒ K = 273.16 K
Hence, the triple point of water on the Kelvin scale is 273.16 K.
Ques. What is the Kelvin Temperature Scale? (1 Mark)
Ans. The scale of temperature whose zero coincides with -273.15 ∘C is known as the Kelvin scale or Absolute scale.
Ques. What is absolute zero on the kelvin scale? (1 Mark)
Ans. The zero of the absolute scale of temperature is denoted by 0 K and is hence known as absolute zero.
Ques. What are the uses of the Kelvin scale? (2 Marks)
Ans. The Kelvin scale is commonly used to determine color temperature, as well as in lighting. In lighting applications, Kelvin temperature refers to the color temperature that corresponds to an object's physical temperature, such as white, blue, or bright red.
Ques. Convert 900 K to Celsius. (2 Marks)
Ans. The Kelvin to Celsius formula is given by
C = K - 273.15
We have, K = 900 K
On substituting the value, we get
C = 900 - 273.15
⇒ C = 626.85 ∘C
Therefore, 700 K = 626.85 ∘C
Ques. Convert 400 K to Celsius. (2 Marks)
Ans. The Kelvin to Celsius formula is given by
C = K - 273.15
We have, K = 400 K
On substituting the value, we get
C = 400 - 273.15
⇒ C = 126.85 ∘C
Therefore, 400 K = 126.85 ∘C
Ques. Convert 1000 K to Celsius. (2 Marks)
Ans. The Kelvin to Celsius formula is given by
C = K - 273.15
We have, K = 1000 K
On substituting the value, we get
C = 1000 - 273.15
⇒ C = 726.85 ∘C
Therefore, 700 K = 626.85 ∘C
Ques. Convert 373.15 K to Celsius. (2 Marks)
Ans. The Kelvin to Celsius formula is given by
C = K - 273.15
We have, K = 373.15 K
On substituting the value, we get
C = 373.15 - 273.15
⇒ C = 100 ∘C
Therefore, 700 K = 426.85 ∘C
Ques. The normal body temperature in Celsius scale of temperature is 37 ∘C. Convert it to Kelvin. (2 Marks)
Ans. Given, the normal body temperature in degrees Celsius, C = 37 ∘C
The Celsius to Kelvin formula is given by
K = C + 273.15
On substituting the value, we get
K = 37 + 273.15
⇒ K = 310.15 K
Therefore, the normal body temperature on the Kelvin scale of temperature is 310.15 K
So, the human body temperature in Celsius is 37°C.
Ques. The boiling point of hydrogen is 20.28 K and its melting point is 14.01 K. What is the value of temperature in Celsius? (2 Marks)
Ans. Given
- The boiling point of hydrogen = 20.28 K
- The melting point of hydrogen is 14.01 K
The boiling point of hydrogen on the Celsius scale is given by
C = K – 273.15
⇒ C = 20.28 – 273.15
⇒ C = – 252.87 oC
The melting point of hydrogen on the Celsius scale is given by
C = K – 273.15
⇒ C = 14.01 – 273.15
⇒ C = – 259.14 oC
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