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Mechanical Properties Of Fluids

Question
CBSEENPH11019513

What are the disadvantages of pyrometers?

Solution
Disadvantages of pyrometer are: 
i) Stefan's law, which is applicable to perfectly black body is used in radiation pyrometer to find the temperature  of the body. In actual practice hot body may not be ideally black body, therefore there will be error in the measurement of temperature.
ii) The optical pyrometer cannot be used to measure the temperature of hot body below 600°C because the image of hot body is not brilliant for temperature below 600°C.