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Which one is having highest emissivity?

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+1 vote
in Mass Transfer by (37.1k points)
Which one is having highest emissivity?

(a) Red brick

(b) Concrete

(c) Black paint

(d) Dull stainless steel

I got this question during an interview.

This interesting question is from Emissivity topic in chapter Modes and Diffusion of Mass Transfer

1 Answer

0 votes
by (39.8k points)
The correct choice is (c) Black paint

Explanation: Emissivity of black paint is 0.97 while that of red brick, concrete and dull stainless steel are 0.93, 0.88 and 0.21 respectively.

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