In engineering, fiction, and thought experiments, Unobtanium also spelled Unobtainium is any fictional, extremely rare, costly, or impossible material, or (less commonly) device needed to fulfill a given design for a given application. The properties of any particular Unobtanium depend on the intended use. For example, a pulley made of Unobtanium might be massless and frictionless; however, if used in a nuclear rocket, Unobtanium would be light, strong at high temperatures, and resistant to radiation damage. The concept of Unobtanium is often applied flippantly or humorously.

The word Unobtanium is derived from unobtainable + -ium (the suffix for a number of elements). It pre-dates the similar-sounding IUPAC systematic element names, such as Ununoctium.

Engineering origin

Since the late 1950s,^[1][2] aerospace engineers have used the term "Unobtanium" when referring to unusual or costly materials, or when theoretically considering a material perfect for their needs in all respects, except that it does not exist. By the 1990s, the term was in wide use, even in formal engineering papers such as "Towards Unobtanium [new composite materials for space applications]."^[3] The word Unobtanium may well have been coined in the aerospace industry to refer to materials capable of withstanding the extreme temperatures expected in reentry.^[2] Aerospace engineers are frequently tempted to design aircraft which require parts with strength or resilience beyond that of currently available materials.

Later, Unobtanium became an engineering term for practical materials that really exist, but are difficult to get.^[4] For example, during the development of the SR-71 Blackbird spy plane, Lockheed engineers at the "Skunk Works" under Clarence "Kelly" Johnson used Unobtanium as a dysphemism for titanium. Titanium allowed a higher strength-to-weight ratio at the high temperatures the Blackbird would reach, but the Soviet Union controlled its supply and was trying to deprive the US armed forces of this valuable resource.^{[nb 1]}

In the 1970s, bicycle magazines, such as Bike World, sometimes referred to exotic lightweight bicycle parts as being made of unobtanium, although while expensive they were commercially obtainable. In the same period, driver & engineer Mark Donohue claimed Unobtanium was used in the construction of Penske race cars.

Contemporary popularization

As of 2010, the term has diffused beyond engineering, and appears in the headlines of mainstream newspapers, especially to describe the commercially useful rare earth elements (particularly terbium, erbium, dysprosium, yttrium, and neodymium). These are essential to the performance of consumer electronics and green technology, but the projected demand for them so outstrips their current supply that they are called "Unobtaniums" within the ore industry,^[5] and by commentators on the US Congressional hearings into the "supply security" of rare-earths.^[6][7]

"Unobtanium" has come to be used as a synonym for "unobtainable" among people who are neither science fiction fans nor engineers to denote an object that actually exists, but which is very hard to obtain either because of high price (sometimes referred to as "unaffordium") or limited availability. It usually refers to a very high-end and desirable product; for instance, in the mountain biking community, "These titanium hubs are Unobtanium, man!" Old-car enthusiasts use "Unobtanium" to describe parts that are vanishingly rare or no longer available.^[8][9]

In maintaining old equipment, Unobtanium refers to replacement parts that are no longer made, such as parts for reel-to-reel audio-tape recorders, or rare vacuum tubes that cost more than the equipment they are fitted to (especially true of certain vacuum tubes, such as the 1L6, used almost exclusively in American battery-powered shortwave radios or the WD-11 used in certain early 1920s radios).

There have been repeated attempts to attribute the name to a real material. Because of the long-standing usage of the term "Unobtanium" within the space elevator research community to describe a material with the necessary characteristics,^[10][11] LiftPort Group President Michael Laine has advocated assigning the term as the generic name for cables woven of carbon nanotube fibers, which seem to satisfy the requirements for this application. Since he claimed that sufficiently long nanotube cables will be prohibitively expensive to develop without inexpensive access to microgravity, these cables would still be close enough to unobtainable to meet the definition. However, this usage does not seem to have become widespread. The eyewear and fashion wear company Oakley, Inc. also frequently denotes the material used for many of their eyeglass nosepieces and earpieces, which has the unusual property of increasing tackiness and thus grip when wet, as unobtanium.

Frequent Sunday night/Monday morning host of Coast to Coast AM George Knapp usually opens his show mentioning Unobtanium. As a play on the word, Obtainium is an album by Skeleton Key, released in 2002 by Ipecac Recordings.

Cryptocurrency

The Cryptocurrency Unobtanium^[12] is a pure SHA256-based (the same as Bitcoin) token. Ultra rarity is a special characteristic. Halving every 102,000 blocks, only 196,875 Proof of Work UNO will be minted^[13]. Block reward of .001 coin for the first 2000 blocks to come up to target, no premine. Block reward of 1 coin per block, halving every 102,000 blocks and finishing with a minimum subsidy of .00001 after 612,000 blocks. Maximum of 250,000 coins ever^[14]. Contrary to other crypto-currencies the "rockchain"^[15] is relatively immune to dust and bloat.

Science fiction

Unobtanium can refer to any substance needed to build some device critical to the plot of a science fiction story, but which does not exist in the universe as we know it. A hull material that gets stronger with pressure in the film The Core was nicknamed Unobtanium, but the concept under different names can be seen in the anti-gravity material cavorite and the super-strong material scrith from Larry Niven's novel Ringworld, which requires a tensile strength on the order of the forces binding an atomic nucleus together. More recently, it was the ore mined on the moon Pandora in the movie Avatar, where the compound was described as key to human space exploration and survival,^[7][16] though it was spelled "unobtanium" in that setting.^[17]

Unobtanium can also refer to any rare but desirable material used to motivate a conflict over its possession, making it a MacGuffin (it appears in the story as something to obtain, not something that is significantly used).

Unobtanium can be used in a disparaging context (e.g., "That idea is silly; you'd need Unobtanium wires to hold the planet up!") or a hypothetical one ("If one were to build an Unobtanium shell around a black hole's event horizon, what would happen to the material piling up on it?").

Similar terms

The term handwavium (suggesting handwaving) is another term for this hypothetical material, as are buzzwordium, impossibrium, hardtofindium, flangium, and, less commonly, phlebotinum.

The term Eludium (also spelled with variants such as Illudium) has been used to describe a material which has eluded attempts to develop it.

Another largely synonymous term is wishalloy,^[18] although the sense is often subtly different in that a wishalloy usually does not exist at all, whereas Unobtanium may merely be unavailable.

A similar conceptual material in alchemy is the Philosopher's Stone, a mythical substance with the ability to turn lead into gold or bestow immortality and youth. While the search to find such a substance was not successful, it did lead to discovery of a new substance - Phosphorus.

See also

• List of fictional elements, materials, isotopes and atomic particles
• Materials science in science fiction

References

Footnotes

External links

• A Note on Unobtanium
• World Wide Words — Unobtanium
• Going Up? Private Group Begins Work on Space Elevator
• Template:Tvtropes
• Unobtanium Crypto-Currency