Smrcak15 wrote:pa ko prica o jestivim uljima ba, sta je vama, jeste li vi nesto popili zestoko ovih dana???
Pa, od ulja se i ne pravi.
https://en.wikipedia.org/wiki/Petroleum
Petroleum (from Latin: petra: "rock" + oleum: "oil". is a naturally occurring, yellow-to-black liquid found in geological formations beneath the Earth's surface....
It is refined and separated, most easily by distillation, into a large number of consumer products, from gasoline (petrol) and kerosene to asphalt and chemical reagents used to make plastics and pharmaceuticals.
Sutite svega vi, i ne brukajte se vise, dosta se PreDozirani obrukao po ovom pitanju pa nemoj i ti jos
Bolan, vidiš da te zezam. Naravno da ne govorimo o jestivim uljima. Igra riječi, moj Smrčak. Opusti se malo i uživaj.
Iako, pazi sad ovo:
"History
Lubicants have been in some use for thousands of years. Calcium soaps have been identified on the axles of chariots dated to 1400 BC. Building stones were slid on oil-impregrated lumber in the time of the pyramids.
In the Roman era, lubricants were based on olive oil and rapeseed oil, as well as animal fats. The growth of lubrication accelerated in the Industrial Revolution with the accompanying use of metal-based machinery.
Relying initially on natural oils, needs for such machinery shifted toward petroleum-based materials early in the 1900s. A breakthrough came with the development of vacuum distillation of petroleum, as described by the Vacuum Oil Company. This technology allowed the purification of very nonvolatile substances, which are common in many lubricants.[1]
Properties
A good lubricant generally possesses the following characteristics:
A high boiling point and low freezing point (in order to stay liquid within a wide range of temperature)
A high viscosity index
Thermal stability
Hydraulic stability
Demulsibility
Corrosion prevention
A high resistance to oxidation.
Formulation
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, silicones, 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 powders (dry graphite, PTFE, molybdenum disulphide, tungsten disulphide, etc.), PTFE tape used in plumbing, air cushion and others. Dry lubricants such as graphite, molybdenum disulphide and tungsten disulphide also offer lubrication at temperatures (up to 350 °C) higher than liquid and oil-based lubricants are able to operate. Limited interest has been shown in low friction properties of compacted oxide glaze layers formed at several hundred degrees Celsius in metallic sliding systems, however, practical use is still many years away due to their physically unstable nature."
Dakle, ni jestiva ulja nisu za odbaciti kada treba podmazati da lakše klizi...
Odjednom Sekar i ne deluje tako lose.
ocigledno trolas samog sebe...doduse neki minimalni dzentlmenski maniri da priznas gresku od tebe se bas i nije ocekivalo, iako su ti podastruti dokazi...sad ti i engleski smeta...