Q. 55.0( 2 Votes )

The freezing of biotechnology products like vaccines require ________ freezing system.
A. Helium

B. Nitrogen

C. Ammonia

D. Chlorine

Answer :

Liquid N2 can achieve temperatures as low as -196 degrees C. It’s cryogenic. This allows preservation. Moreover, though liquid He is also cryogenic, it leads to formation of ice crystals which may damage the biotechnology products.

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