General Knowledge - General Science - Discussion

Because graphite is very soft. So graphite is used lubricant.

The graphite is very soft & so graphite is used by lubricant.

It is able to offer lubrication at temperatures higher than liquid and oil-based lubricants can operate.

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Because in the graphite the covalent bonds are less tightly bounded so the graphites have smooth surface. So by this reason the graphite are used as lubricants.

Because in graphite the two layes slip over each other due to less tightly coavalent bonding btween these layers. This makes graphite a lubricant.

Because graphite is soft than others and have some brightness

Graphite is the 'gray lead in your drawing pencil. Graphite is not lead at all; the misnomer arose because it was mistaken for a form of lead when first discovered in England. Graphite is in fact a form of carbon, and is non-toxic. Pencils have never been made from lead, but it was not until the late 18th century that the true composition of the material was identified, and the original name stuck. Modern pencil cores contain an extruded blend of pulverised graphite and clay.

The individual atoms of graphite are hexagonal in shape and are arranged in overlapping sheets. Although the bonding between the atoms in a particular sheet is strong, the bonding between the atoms of successive sheets is weak. Due to this weak bonding between the atoms in the overlapping sheets, there is a tendency for the sheets to easily slide over each other, which causes slipperiness. It is because of this slipperiness effect that graphite acts as a good lubricant.

I agree with kalpana.