Billionth

From Wikipedia, the free encyclopedia
Jump to: navigation, search

One billionth is the reciprocal of a billion, which means it has one of two definitions depending on whether the long scale or short scale definition is being used.[1]

Short scale[edit]

In the short (or American) scale, a billionth is equal to 0.000 000 001, or 1 x 10−9 in scientific notation. The prefix for this number is nano, and is abbreviated as "n" (for example, in electronics, one nanofarad would be written as 1 nF).[2]

Long scale[edit]

In the long (or English) scale, a billionth is equal to 0.000 000 000 001, or 1 x 10−12 in scientific notation. The prefix for this number is pico-, and is abbreviated as "p" (for example, in electronics, one picofarad would be written as 1 pF).[3]

References[edit]

  1. ^ Gardner, J. W. (April 6, 1961), "How many is a billion?", Letters, New Scientist: 888 .
  2. ^ Carstairs-McCarthy, Andrew (2002), An Introduction to English Morphology: Words and Their Structure, Edinburgh University Press, pp. 109–110, ISBN 9780748613267 .
  3. ^ Bray, Charles (2001), Dictionary of Glass: Materials and Techniques, University of Pennsylvania Press, p. 243, ISBN 9780812236194 .


Preceded by
Millionth
Decimals Succeeded by
Trillionth