Scientists are lobbying for a new word to help them describe numbers larger than 1,000,000,000,000,000,000,000,000,000, amid concerns that the current system of units is insufficient.
Telegraph UK
By Matthew Moore
A campaign for "hella" to join the likes of "kilo", "mega" and "giga" as an internationally accepted prefix is attracting growing support.
More than 20,000 scientists, students and members of the public have signed an online petition backing the new quantity, which would be used for figures with 27 zeros after the first digit.
Currently the highest prefix allowed by the International System of Units (SI) is the "yotta", for 24 zeroes.
Austin Sendek, the physics student at the University of California who started the campaign, said that recent scientific developments required that the scales of measurement be extended.
"The analysis of many physical phenomena reveals natural quantities in excess of 27 orders of magnitude, a number which is currently ignored by the SI system," he wrote on the Facebook petitionoutlining the case for the hella.
"Designating a prefix for 10^27 is of critical importance for scientists in all fields. This number is significant in many crucial calculations, including the wattage of the sun, distances between galaxies, or the number of atoms in a large sample."
The amount of energy released by the Sun would be more elegantly expressed as 0.3 hellawatts than as 300 yottawatts, he added.
Hella is North Californian slang for "very" or "a lot of". Mr Sendek and his supporters argue that its adoption would be a fitting honour for the state's impressive record of scientific research.
If the change is approved, the hella would be the first new SI prefix introduced since 1991, when the International Committee for Weights and Measures approved yotta and zetta (21 zeroes).
Mr Sendek has already contacted the British chemist who heads the Consultative Committee for Units (CCU), the body which advises the international committee, in the hope of building support.
Professor Ian Mills of the University of Reading has promised to raise the petition at the next meeting of the CCU but said it was unlikely that the hella would win approval.
He said: "The general feeling has always been that it would not be sensible to recommend extensions to the prefixes that would be rarely used, because users would not remember them and would not recognise their meaning when they see them."
In a letter to Mr Sendek he added: "I will mention this exchange at our next CCU meeting, and I am sure it will be received with smiles - but I doubt that it will go further!"
Prof Mills suggested that a simpler option would be for the committee to relax rules banning compound prefixes, so that, for instance, a hella could be expressed as a kiloyotta.
FULL LIST OF SI PREFIXES
10 = deca
100 = hecto
1,000 = kilo
1,000,000 = mega
1,000,000,000 = giga
1,000,000,000,000 = tera
1,000,000,000,000,000 = peta
1,000,000,000,000,000,000 = exa
1,000,000,000,000,000,000,000 = zetta
1,000,000,000,000,000,000,000,000 = yotta
HAVE YOUR SAY: WHAT WOULD YOU CALL THE NEW PREFIX?
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