2006-11-09 20:48:38 · 13 answers · asked by Reva 1 in Science & Mathematics ➔ Earth Sciences & Geology
Forget to give choices?
O.K., I am giving the choices.
But it all depends upon the applications where it is required.
Lubricants are an essential part of modern machinery. Everything from computer hard disk drives to the Airbus A380 requires lubrication of its moving parts.
I mean with respect to rpm of the equipment , size of the equipment , temperature of the equipment and type of the equipment.
Typically 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.
Non-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.
Lubricants 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.
In 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.
[edit] Synthetic oils
Polyalpha-olefin (PAO)
Synthetic esters
Polyalkylene glycols (PAG)
Phosphate esters
Alkylated naphthalenes (AN)
Silicate esters
Ionic fluids
Note: In the USA certain Group III base stocks may be designated as synthetic; typically hydrocracked oils.
Solid lubricants
Graphite
Molybdenum disulphide
Teflon
Boron nitride
please visit following for more information:
http://en.wikipedia.org/wiki/Lubricant
2006-11-09 22:38:58 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Saliva
2006-11-09 20:49:48 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Jigaloo
2006-11-09 20:56:18 · answer #3 · answered by mike 2 · 0⤊ 0⤋
I am still looking for the choices.
2006-11-09 22:02:25 · answer #4 · answered by tnkumar1 4 · 0⤊ 0⤋
I'm guessing you meant to put choices here and forgot.
2006-11-09 20:50:00 · answer #5 · answered by D 3 · 1⤊ 0⤋
the only obvious choice is the banana peel.
2006-11-09 21:05:35 · answer #6 · answered by Barabas 5 · 0⤊ 0⤋
All of the above.
2006-11-09 20:50:02 · answer #7 · answered by Anonymous · 0⤊ 0⤋
Oil?
2006-11-09 20:53:11 · answer #8 · answered by Anonymous · 0⤊ 0⤋
Where are the choices? Were you not supposed to enumerate? lol.
2006-11-09 20:49:58 · answer #9 · answered by Muffin 4 · 1⤊ 0⤋
ALL OF THE ABOVE
2006-11-09 20:50:15 · answer #10 · answered by Anonymous · 0⤊ 0⤋