Which among the following substances is used as a lubricant?
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Forget to give choices?\nO.K., I am giving the choices. \nBut it all depends upon the applications where it is required.\nLubricants are an essential part of modern machinery. Everything from computer hard disk drives to the Airbus A380 requires lubrication of its moving parts.\nI mean with respect to rpm of the equipment , size of the equipment , temperature of the equipment and type of the equipment.\n\nTypically lubricants contain 90% base oil (most often petroleum fractions, called mineral oils) and less than 10% additives. Vegetable oils or synthetic liquids such as hydrogenated polyolefins, esters, silicone, fluorocarbons and many others are sometimes used as base oils. Additives deliver reduced friction and wear, increased viscosity, improved viscosity index, resistance to corrosion and oxidation, aging or contamination, etc.\n\nNon-liquid lubricants include grease, powders (dry graphite, PTFE, Molybdenum disulfide, etc.), teflon tape used in plumbing, air cushion and others. Another approach to reducing friction and wear is to use bearings such as ball bearings, roller bearings or air bearings or to use sound, in the case of acoustic lubrication.\n\nLubricants such as 2-cycle oil are also added to some fuels. Sulfur impurities in fuels also provide some lubrication properties, which has to be taken in account when switching to a low-sulfur diesel; biodiesel is a popular diesel fuel additive providing additional lubricity.\n\nIn addition to automotive and industrial applications, lubricants are used for many other purposes, including K-Y Jelly, often used as a personal lubricant, bio-medical applications (e.g. lubricants for artificial joints) and others.\n[edit] Synthetic oils\nPolyalpha-olefin (PAO) \nSynthetic esters \nPolyalkylene glycols (PAG) \nPhosphate esters \nAlkylated naphthalenes (AN) \nSilicate esters \nIonic fluids \nNote: In the USA certain Group III base stocks may be designated as synthetic; typically hydrocracked oils.\n\nSolid lubricants\nGraphite \nMolybdenum disulphide \nTeflon \nBoron nitride \n\nplease visit following for more information:\nhttp://en.wikipedia.org/wiki/Lubricant
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Lotion. Oil is too messy.
111373
k-y lubricating gel. its what all doctors use so you know its the best.
834914
You can use a personal lubricant.
1164739
Mcdonald's oil...\n\nand your *wink*wink* natural gas
605041
water, rubbing alcohol or if nothing else acid :P(dont really do acid)
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Vegetable oil and isopropyl alcohol.  Put a little food coloring in to help differentiate between the two (it will only dissolve in the alcohol)
80429
The CRC Handbook of Chemistry and Physics has all kinds of good information like that (although it is pricey).\n\nOr, search the web for the specific liquid of interest.
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graphite based lubes \n\nor silicon based lubes like KY jelly
121699
Surface tension\n\nWater's utility as the universal solvent.
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ethylenediaminetetraacetic acid\n\nIt has lots of commercial uses and is used in making all kinds of things such as beer, canned food, and shampoo. In fact more than 100,000 metric tons are created every year.
818188
http://www.eia.doe.gov/neic/infosheets/petroleumproducts.htm
373645
at any automotive parts store....ask for a fan belt lubricant...in the meantime, use a bar of soap
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Vaseline\nSolvents used in paint\nlubricating oils\nGrease\nAsphalt\nVariety of Plastics\n... and many more, can't think of them all.
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do not use that!   use paintball marker oil at a paintball gun store...dicks sporting goods should have it
876122
SOME LUBE  http://www.boybutterlubes.com/ lol
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Here is a project you could do regarding lubricants here http://www.col-ed.org/cur/sci/sci128.txt  or check out the Exxon-Mobil education website http://www.exxonmobilchemical.com/public_pa/WorldwideEnglish/CorpCitizenship/SciEdu/OC_citizen_science.asp or this link for Exxon-Mobil http://www.exxonmobilchemical.com/public_pa/WorldwideEnglish/CorpCitizenship/SciEdu/OC_citizen_science.asp