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1. 
Measurments in
Informatics.
Fátima Chamorro & Paula Ramírez.

2. EXABYTE

 It was added to the International System of Units (SI) in 1975.
 It has the unit symbol EB.
 Denoting a factor of 1018 or 1.000.000.000.000.000.000.
 Exa means six (like hexa) , because it is equal to 1.0006.
 Example: In 2004, the global monthly Internet traffic passed 1
exabyte for the first time.

3. PETABYTE

 It was added in the International System of Units in 1975.
 It has the unit symbol PB.
 Denoting a factor of 1015 (1.000.000.000.000.000).
 Peta means five and because of that it is similar to the prefix
penta .
 Example:The 2009 movie Avatar is reported to have taken over
1 petabyte of local storage at Weta Digital for the rendering of
the 3D CGI effects.

4. TERABYTE

 It was added ,for use in the SI,in 1960.
 It has the unit symbol TB.
 Denoting a factor of 1012 or 1.000.000.000.000.
 Tera means ¨monster¨.
 For example:As of May 2009, Yahoo! Groups had 40
terabytes of data to index.

5. GIGABYTE

 The earliest written use of giga in this sense to be in
the Reports of the IUPAC 14th Conference in 1947.
 It has the unit symbol GB.
 Denoting a factor of a (short-form) billion
(109 or 1.000.000.000).
 The binary prefix gibi has been adopted for 230, while
reserving giga exclusively for the metric definition.
 A typical hard disk has a capacity of 500Gb

6. MEGABYTE

 It was confirmed for use in the International System
of Units (SI) in 1960.
 It has the unit symbol MB.
 Denoting a factor of one million (106 or 1.000.000).
 Mega means ¨great¨.
 In early days, memory cards for devices had only an
amount of a few megabytes.

7. KILOBYTE

 It was originally adopted by Antoine Lavoisier's
research group in 1795, and introduced into the
metric system in France in 1799.
 It has the unit symbol kB.
 Denoting a factor of one thousand ( 1000)
 Kilo means ¨thousand¨.
 Ten years ago there were floppy disks instead of pen
drives with only 720 KB capacity

8. HECTO

 It was adopted as a multiplier in 1795.
 It has the unit symbol H.
 Denoting a factor of one hundred (100)
 Hecto means ¨hundred¨
 Usain Bolt only takes 9,5 seconds for running 1
Hectometer

9. DECA

 The prefix was a part of the original metric system in
1795.
 It has the unit symbol DA.
 Denoting a factor of ten. Deca means ¨ten¨.
 It is not in very common usage, although the
decapascal is occasionally used by audiologists.
 The blue whale is approximately 3 decameters in
length.

10. BYTE

 It was added in 1957 in the International System
 It has the unit symbol B.
 Denoting a factor of 1.
 It consists of eight bits.
 The ASCII code (how internally are represented
letters in computers) represents each letter in one
byte (8 bits)

11. DECI

 Adopted in 1795 in the International System.
 Its most frequent use is in the non-SI unit,
the decibel, used to measure sound intensity.
 It has the unit symbol d.
 Denoting a factor of 10-1 (0,1)
 Deci means ¨tenth¨.
 A CD diameter is about 1,2 decimeters.

12. CENTI

 It was added in the to the International System in
1795.
 It has the unit symbol c.
 Denoting a factor of
 Centi means ¨hundred¨.
 It is mainly used to express lengths in centimetres
 A honeybee is about 1.3 centimeters in length.

13. MILLI

 It was added in 1795 in the International System.
 It has the unit symbol m.
 Denoting a factor of one thousandth (10-3).
 Milli means ¨one thousand¨
 A snow crystal is about 1 millimeter in diameter.

14. MICRO

 Confirmed in 1960.
 It has the unit symbol μ.
 Denoting a factor of 10−6 (one millionth).
 Micro means ¨small¨.
 Typical bacteria are 1 to 10 micrometers in diameter.

15. NANO

 It was officially confirmed as standard in 1960.
 It has the unit symbol n.
 Denoting a factor of 10−9 or 0.000000001.
 Nano means one billionth.
 It is frequently encountered in science and
electronics.
 One nanometer is about the length that a fingernail
grows in one second.

16. PICO

 It defined in 1960 when the International System of
Units was established.
 It has the unit symbol p.
 Denoting one trillionth, a factor of 10-12(0.000000000001).
 Pico means peak, beak, bit.
 The radius of atoms range from ~25 picometers
(hydrogen) - 260 picometers (caesium).

17. FEMTO

 Adopted by the 11th Conférence Générale des Poids et
Mesures.
 It has the unit symbol f.
 Denoting a factor of 10−15 or 0.000000000000001.
 Femto means "fifteen".
 The femtometre shares the unit symbol (fm) with the older
non-SI unit fermi, to which it is equivalent.
 A proton has a diameter of about 1.6 to 1.7 femtometres.

18. ATTO

 The unit multiple was adopted at the 12th
Conférence Générale des Poids et Mesures (CGPM)
in Resolution 8.
 It has the unit symbol a.
 Denoting a factor of 10−18 or 0.000000000000000001.
 Atto means "eighteen".
 Weight of the HIV-1 Virus is about 1 ag.

19. 
The End.
By Fátima Chamorro & Paula Ramírez.