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The purity of a gas is generally expressed as a grade prefixed with the letter N (rather than postfixed), indicating the "number of nines" in the percentage or decimal fraction. For example, a N2.0 gas is 99% (two nines) pure and 1% impurities by volume; a N6.0 gas is 99.9999% (six nines) pure, with 1 part per million (1 ppm or 1 vpm, volume ...
(also written as 0. 9, 0.., or 0.(9)) is a repeating decimal that is an alternative way of writing the number 1. Following the standard rules for representing numbers in decimal notation, its value is the smallest number greater than or equal to every number in the sequence 0.9, 0.99, 0.999, .... It can be proved that this number is 1; that is,
A fixed-point representation of a fractional number is essentially an integer that is to be implicitly multiplied by a fixed scaling factor. For example, the value 1.23 can be stored in a variable as the integer value 1230 with implicit scaling factor of 1/1000 (meaning that the last 3 decimal digits are implicitly assumed to be a decimal fraction), and the value 1 230 000 can be represented ...
a composite number; a square-prime, of the form (p 2, q). It is the 11th composite number of this form and the third of the form (3 2, q). It has an aliquot sum of 57, within an aliquot sequence of two composite numbers (99,57,23,1,0), to the Prime in the 23-aliquot tree. a Kaprekar number [1] a lucky number; a palindromic number in base ten ...
In general, the number of nines is not often used by a network engineer when modeling and measuring availability because it is hard to apply in formula. More often, the unavailability expressed as a probability (like 0.00001), or a downtime per year is quoted.
[1] [2] The percentage, denoted (95% and 99% are typical values), is a coverage probability, called confidence level, degree of confidence or confidence coefficient; it represents the long-run proportion of CIs (at the given confidence level) that contain the true value of the parameter. For example, out of all intervals computed at the 95% ...
[1] [4] According to IUPAP, "a continued source of annoyance to unit purists has been the continued use of percent, ppm, ppb, and ppt". [5] Although SI-compliant expressions should be used as an alternative, the parts-per notation remains nevertheless widely used in technical disciplines. The main problems with the parts-per notation are set ...
It refers to the increased concentration of income and wealth since the 1970s among the top 1% of income earners in the United States. [26] It also reflects the idea that the "99%" are paying the price for the mistakes of a tiny minority within the upper class. [27] [28] A chart showing the disparity in income distribution in the United States.