Number 8 in Science & Technology

A page of the Numeropedia - the Special Encyclopedia of Numbers

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 One of seven magic numbers in nuclear physics: 2, 8, 20, 28, 50, 82 and 126. They are the numbers of nucleons such that they are arranged into complete shells within the atomic nucleus.

 

The highest level in the scale to measure the amount of cloud in the sky: 8 oktas =is totally clouded and 0 okta is completely clear.

 

The number of digits in a UPC Version E (Universal Product Code for North America) barcode used on small, compressed package: digit 0 or 1 (number system), followed by 6-digit code and ended by a check digit. The 6-digit code is converted from the 10 digits (two 5-digit codes) of the 12-digit UPC-version A, by some rules to eliminate the extra “0”.

 

The number of digits of the EAN-8 barcode, a superset of the North America’s 8-digit UPC-version E.

 

Figure Eight knot, a popular knot often used in the end of a string when tying a package with a slipknot or end of a rope forming a lariat loop.

 

The “number system” code of an EAN-13 barcode for the U.S. and Canada’s products: 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12 and 13.

 

8.3

The universal gas constant: R = 8.3143J/mole.oK.

Boltzmans’s constant k = R/NA = 1.3806×10–23J/oK.

 

8.4

The voltage of a Ni-Cad rechargeable battery of type AA, AAA, C, D and N is usually 1.2V (less than 1.5V of non-rechargeable batteries). Other values: PP3 – 1.2V – 3.6V – 4.8V – 8.4V.