Multiple choice

We cannot use graphite as a lubricant in space because

  1. there is no atmosphere in space and so graphite sublimes in space

  2. there is no atmosphere in space and so there is no adsorbed air and water between layers of graphite

  3. absence of external pressure transforms crystalline graphite to amorphous graphite

  4. none of the above is correct
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

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