what is lubricant? explain viscosity and cloud ?
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Viscosity Index – The viscosity index, or VI, of a lubricant describes how the oil's viscosity changes as its temperature changes. ... Cloud Point – Petroleum-based lube oils contain dissolved wax. At a low enough temperature, referred to as the cloud point, this wax will separate from the oil and form wax crystals
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lubricant is like the oil which make the machine work easily its is the denser then water
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