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Decimal degrees are an alternative to using sexagesimal degrees (degrees, minutes, and seconds - DMS notation). As with latitude and longitude, the values are bounded by ±90° and ±180° respectively. Positive latitudes are north of the equator, negative latitudes are south of the equator.
Nano (symbol n) is a unit prefix meaning one billionth.Used primarily with the metric system, this prefix denotes a factor of 10 −9 or 0.000 000 001.It is frequently encountered in science and electronics for prefixing units of time and length.
A repeating decimal or recurring decimal is a decimal representation of a number whose digits are eventually periodic (that is, after some place, the same sequence of digits is repeated forever); if this sequence consists only of zeros (that is if there is only a finite number of nonzero digits), the decimal is said to be terminating, and is not considered as repeating.
Standard form may refer to a way of writing very large or very small numbers by comparing the powers of ten. It is also known as Scientific notation.Numbers in standard form are written in this format: a×10 n Where a is a number 1 ≤ a < 10 and n is an integer.
Nanotechnologies are based on physical processes which occur on a scale of nanometres (see nanoscopic scale). [1]The nanometre is often used to express dimensions on an atomic scale: the diameter of a helium atom, for example, is about 0.06 nm, and that of a ribosome is about 20 nm.
For example, the conversion factor between a mass fraction of 1 ppb and a mole fraction of 1 ppb is about 4.7 for the greenhouse gas CFC-11 in air (Molar mass of CFC-11 / Mean molar mass of air = 137.368 / 28.97 = 4.74). For volume fraction, the suffix "V" or "v" is sometimes appended to the parts-per notation (e.g. ppmV, ppbv, pptv).
One millionth is equal to 0.000 001, or 1 x 10 −6 in scientific notation. It is the reciprocal of a million, and can be also written as 1 ⁄ 1,000,000. [1] Units using this fraction can be indicated using the prefix "micro-" from Greek, meaning "small". [2] Numbers of this quantity are expressed in terms of μ (the Greek letter mu). [3]
Scientific notation always has a single nonzero digit to the left of the point: not 60.22 × 10 22, but 6.022 × 10 23. Engineering notation is similar, but with the exponent adjusted to a multiple of three: 602.2 × 10 21. Avoid mixing scientific and engineering notations: A 2.23 × 10 2 m 2 region covered by 234.0 × 10 6 grains of sand.