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Graphite's lubricant nature in moon

$\begin{array}{1 1}(a)\;Increases&(b)\;Decreases\\(c)\;Remains\;same&(d)\;Invalid\;question\end{array}$

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Lubricant nature depends not only in the sillipage between the planes,but also on a film of moisture or gas molecules absorbed on the surface of graphite layers.Dry graphite in vaccum is not slippery.
Hence (b) is the correct answer.
answered Nov 28, 2013 by sreemathi.v
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