Question

Why graphite is a good lubricant on moon than on earth?

Answer 1

Graphite and graphite powder are valued in industrial applications for its self-lubricating and dry lubricating properties. There is a common belief that graphite's lubricating properties are solely due to the loose interlamellar coupling between sheets in the structure. However, it has been shown that in a vacuum environment (such as in technologies for use in space), graphite is a very poor lubricant. This observation led to the discovery that the lubrication is due to the presence of fluids between the layers, such as air and water, which are naturally adsorbed from the environment. This molecular property is unlike other layered, dry lubricants such as molybdenum disulfide.

Answer 2

Answer:

Explanation:

The temperature on the moon is 1000C and -1500C during day and night time respectively. Oils and greases cannot withstand such temperature changes but graphite is unaffected within this temperature range. Hence, it acts as good lubricant on the surface of the moon. Graphite is the mineral form of carbon