Word Count : 1133

---

Lubricants are essential substances in modern industries, automobiles, and machinery because they reduce friction and wear between moving surfaces, protect against corrosion, dissipate heat, and improve the efficiency and lifespan of mechanical systems. In environmental chemistry, the study of lubricants is not only concerned with their chemical structure and working mechanism but also with their ecological implications, biodegradability, and potential environmental hazards. Understanding their mechanism, classification, and properties provides insight into how these substances function and how they are designed for specific applications. The mechanism of lubricants primarily revolves around reducing friction and wear. When two surfaces move against each other, direct metal-to-metal contact can cause excessive wear, heat generation, and energy loss. Lubricants form a thin film or layer between these surfaces, preventing direct contact and thereby minimizing friction. The lubrication mechanism can be explained through several theories. The first is fluid-film lubrication, where a continuous film of lubricant completely separates the two surfaces. In this regime, the load is carried by the pressure generated in the fluid film, which is typically seen in hydrodynamic lubrication such as in journal bearings. The second is boundary lubrication, which occurs when a thin layer of lubricant molecules, often enhanced with additives, remains adsorbed on the surfaces even when the fluid film is not sufficient to separate them completely. This situation arises in high-load or low-speed conditions. The third is mixed lubrication, which is an intermediate state where partial fluid-film lubrication coexists with some surface asperity contact, often seen in practical machines during start-up or varying load conditions. Besides these, elastohydrodynamic lubrication is another mechanism, where elastic deformation of surfaces and high-pressure lubricant films come into play, particularly in rolling contacts like gears and roller _________ ________ _________ _____ _________.
______ __________ ____ _________ _____.
____ ____ _________ ____ ______ _______ _______.
__________ _________ ________ ____ __________.
________ ___ ____ _____ _________ __________ ________.
_______ _________ __________ _______ ____ _________ ________ ___ ________.
_______ ___ __________ _____ ____ ________ ___ ____ ___.
____ _______ ______ __________ ______ _______ ____ ________.
______ ___ _________ ___ __________ _____ ___.
____ _____ ______ ________ _____ __________ __________ ______.
____ ______ __________ ________ ___.
______ __________ __________ _______ ______ ________ __________ _______ _____.
_________ _________ ____ _____ ___ ____ __________ ___ _____ _______.
___ ________ _______ __________ _______ ____ _______.
_____ _______ _______ ____ ______ ___ _______ ________.
______ ___ _______ ____ _________ ________ ____ ___ _________ ___ _____.
_________ ________ ______ ____ _________ __________ ____ ______ ___ _________ ___ ______.
_______ ________ ____ ________ ____.
_______ ________ ____ _____ _____ ________.
_________ __________ ________ _________ _______ _______.
__________ ___ ________ ______ ________.
__________ ________ _________ _______ ______ ____ _______ __________.
______ _____ _______ ________ ____ ________ _____.
________ ____ ___ ________ _______ ____ ___ _______ ___ ________ _______ ___.
____ _____ _____ ________ ____ _______ ____ ____.
_____ ____ _______ ____ ______ _________.
______ ______ _________ ______ __________ __________ _____ ________ _____.
___ _____ _____ ______ ________ ___ ______ _____ ______.
____ ________ _________ ______ _________ _________.
______ __________ ________ _____ _____ ____ ____ ________.
________ __________ ________ _________ _________ __________.
____ _______ ________ ________ ______ _________.
____ ________ _____ _________ __________ _____ _____ _________ _________ _____ ____.
________ ____ _________ _________ ____ _______ __________ _________.
__________ _______ ____ ________ __________ ___.
_____ ______ ___ __________ _____.
_______ ______ __________ ___ __________ _________ __________ _________.
________ __________ _____ _____ ___ ________ _____ _________ ____ ______.
__________ __________ _____ __________ _________ ________ _______ ______.
_______ _____ ________ ___ ________ ________ _______ ______ _______ _______ _________ _______.
________ ________ ___ ______ _______ _____ _______ ___.
____ ________ _____ _____ _____ ______ ________ ______ ________ ____.
_______ _________ ___ _______ _______ _____ ____ ____ _________.
________ _______ ______ ________ __________.
___ ________ ____ ________ ___ ________ _____ ___ _____ __________ _____ _____.
___ _____ ____ __________ ____ ______ _____ ______.
_______ ___ __________ _____ ___ ___ _____ ___ _____ ________ ______.
_______ _________ _______ _________ _____ _______ ________ _________ ________ ___.
_____ ________ _____ __________ _________ __________ ___.
________ ______ ________ ___ ___ __________.
___ ______ __________ _________ __________.
____ ____ _____ __________ __________ _______ ______ ______ ____ _____ ______ _________.
________ ____ ___ __________ _________ _________ ____ _________ _____ __________ _____.
__________ ___ ____ _____ __________ ____ __________ __________ _____ ________ __________.
________ __________ ________ __________ ________ ______ _____ _________ __________.
______ ______ ____ ___ __________.
____ _______ _______ ______ _______.
________ _________ _____ ________ ____ _____ __________ __________ ___ ______ _________.
_________ ____ ____ __________ ___ ____.
______ ____ ____ ___ _______ _______ _______ ____ _______.
__________ ______ ____ ________ ______ ___ ______ _______ ________.
____ _________ ___ _______ _______ _____ _______ ______ _____ _______ _________ ___.
___ ________ _______ ______ ___ ____.
______ __________ _____ __________ ________ __________ ____ ____.
________ __________ _________ _____ ____ ____ ________ _______ __________ ____.
________ ________ ___ ____ __________ ____ ________ ______ ________ ________.
________ ____ ______ ___ ________ ______ ______ ______.
_____ ________ ___ _______ __________ _____ ____ _____.
_____ _________ _______ _____ _______.
_____ ___ _______ ________ ________ _______ ______ _________.
_________ ________ _____ ___ ______ _____ ___ _________ __________ __________.
______ ________ ___ _____ _____ ____ __________ ________ ____ ______ ______.
________ ____ _______ ____ ____ __________ _________ ___ ______ ____ ______ ____.
_____ ____ __________ ________ _________ ______.
______ _____ ________ _________ _____ __________ ________ __________ ______ ______ ________.
___ _______ _________ ____ ____ _____ _________ _____ _________ ______ ___.
___ __________ ________ _________ ____ _____ ___ ________ _______ __________ _____.
_________ ______ ________ ________ _______ _________.
___ _____ _______ ___ _____ __________ __________ _____ ______ _______.
_________ ____ _____ __________ _________ ________ ____.
____ ___ _________ _______ _____ _______ _____ _______ _____ ________ ___.
___ ____ ________ ______ __________ ___ _________ __________ ____.
________ ________ _______ _____ _________ ____ _______ ________ _____ _____ ________.
______ _______ ___ _________ ______ ________ _____ __________.
_____ ______ ________ _________ ___ __________ ___.
_________ ________ ________ _______ _________ _______ ___ _____ ______ _________ _____ __________.
_________ ___ _____ ____ _________ ______ _____ _______.
___ _____ ____ ______ _________ _________ _____ ________ ________ ___.
_________ ______ _____ ____ ____ ___ ______ _____ ___ __________ ________ ____.
______ ________ _______ ________ ______ ____.
___ ___ ____ ___ ____ ______ ________ ____ _______ __________.
_________ ______ _____ _________ _________ ____ _______ _________ ____ ______ _________.
__________ __________ ________ ______ ____ ________ ____.
____ ______ ______ ___ ____ ____ _______ ____ ______ ______.
_______ _________ ___ __________ _________ __________ ________ ___ __________ ________.
___ ___ __________ _______ _______ __________ ____ __________ __________ ________ ____ _____.
____ _____ __________ __________ _________ ______ _____ ____ __________ ________ __________ ____.
_______ ______ _______ ____ ______.
______ _______ _______ ________ ________ ________ _________.
_____ ________ _____ ________ ___ ______ ________ ________ _______ ______.
___ ___ ___ ________ __________ _________.
Get Full Answer on WhatsApp