Number 9 in Science & Technology

A page of the Numeropedia - the Special Encyclopedia of Numbers

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Prefix: G, Giga- = 109.

SAAB (Swedish Aircraft, Ab. Or Inc.) car has its name starting with a number 9 to indicate it is not a military car.

 American British Number (no entry) septendecillion 10102 septendecillion nonillion 1054 nonillion quintillion 1030 quintillion trillion 1018 trillion billion 1012 billion milliard 109

The popular Alkaline-Manganese battery voltages for household electronic devices: 1.5V – 3V – 4.5V – 6V – 9V, available in popular sizes: AAA, AA, C, D, G and N. The Carbon-Zinc batteries have additional values: 12V – 22.5V – 45V and 90V. Other values: PP3 – 1.2V – 3.6V – 4.8V – 8.4V for Ni-Cad rechargeables.

Credit cards and others identifying numbers, of any length (a1an–1an) used the IBM check digit scheme of modulo 10. The scheme used the permutation p = (0)(1,2,4,8,7,5)(3,6)(9), so it can catch single digit errors and adjacent-digit transposition errors, except that involve 0 and 9. The check digit an is added to the right end of the number, such that:

. If n is even, p(a1)+a2+…+p(an–1)+an = 0 modulo 10,

. If n is odd, a1+p(a2)+a3+…+p(an–1)+an = 0 modulo 10.

The VIN (Vehicle Identification Number) of an automobile has 17 characters to encode information on: manufacturer, plant location, engine style, body style, model year (10th character) and restraint system, where the middle (9th) character of the number a1a9a17 is for the check digit:

a9 = 8a1+7a2+6a3+5a4+4a5+3a6+2a7+10a8+9a10+8a11+7a12+

+6a13+5a14+4a15+3a16+2a17, (modulo 11), after transliterating all letters into numerical values.

9.8...

[Science]  The Earth’s standard gravitational acceleration of free fall: g = 9.80665 m/sec2 (meters/second2) = 32.174 ft/sec2 (feet/second2).

1 kg = 9.80665 N & 1 kg/m2 = 9.80665 N/cm2 (pascals).