Measurement of temperature


 
 
Concept Explanation
 

Measurement of temperature

Measurement of temperature

There are three scales for the measurement of the temperature of a system. These are: degree Celsius (°C), degree Fahrenheit (°F) and Kelvin (K).

On Celsius scale the freezing point of water is taken as 0°C, whereas its boiling point is taken as 100°C. So, this scale is calibrated from 0 to 100°C.

On the Fahrenheit scale, the freezing point of water is 32°F and its boiling point is taken as 212°F. So, this scale is calibrated from 32 to 212°F.

°F = 9/5 (°C) + 32

On the Kelvin scale, the freezing point of water is taken as 273.15K and its boiling point is taken as 373.15K. The Kelvin scale is related to the Celsius scale as follows:

t°C = (273.15 + t)K

For convenience, we use 0°C = 273 K

Sample Questions
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Question : 1

The boiling point of alcohol is large 78^0C. What is this temperature in Kelvin scale ?

Right Option : B
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Question : 2

Convert  25^oC  to Kelvin scale:

Right Option : A
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Question : 3

Which of the following are correct :

(a) On Celsius scale the freezing point of water is taken as 0°C, whereas its boiling point is taken as 100°C. So, this scale is calibrated from 0 to 100°C.

(b) On the Fahrenheit scale, the freezing point of water is 32°F and its boiling point is taken as 212°F. So, this scale is calibrated from 32 to 212°F.

(c) On Celsius scale the freezing point of water is taken as  100°C, whereas its boiling point is taken as 200°C. So, this scale is calibrated from 0 to 100°C.

Right Option : A
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