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Graphite cannot be used as a lubricant i...

Graphite cannot be used as a lubricant in space because

A

absence of external pressure transforms crystalline graphite to amorphous form

B

there is no atmosphere in space, and hence, graphite sublimes in space

C

there is no atmosphere in space, and hence, there is no adsorbed air and water between layers of graphite

D

none of the above

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The correct Answer is:
C
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