Question

What is the temperature of liquid nitrogen (°C)?

(a) -150°C

(b) -122°C

(c) -194°C

(d) -196°C

This question was addressed to me in a national level competition.

My query is from Preservation of Industrial Microorganisms in portion The Isolation, Preservation and Improvement of Industrial Microorganisms of Fermentation Technology

Answer 1

The correct answer is (d) -196°C

Explanation: The temperature of liquid nitrogen is -196°C. It is used to store and preserve the microbial culture for a decade or even more. The cryoprotectants are added to the culture suspension before adding to liquid nitrogen.