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What is the appearance of liquid nitrogen?

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in Engineering Material & Metallurgy by (773k points)
What is the appearance of liquid nitrogen?

(a) Yellow

(b) Colorless

(c) Bluish-gray

(d) Black

The question was asked in an interview.

I would like to ask this question from Cryogenics, Hot and Cold Working of Metals topic in division Mechanical Working Processes & Phase Transformations of Engineering Material & Metallurgy

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Right answer is (b) Colorless

To explain I would say: Liquid nitrogen is a cryogenic liquid formed from nitrogen at low temperatures. It is a colorless liquid that results in brisk freezing.

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