Because the eighth note have a frequency double of the first.
http://en.wikipedia.org/wiki/Octave

On 18/08/2014 21:17, David C Brown wrote:
> No. An octave is an interval of seven notes.  A-B, B-C, C-D, DE, E-F, F-G=
,
> G-A. Seven notes.  So WTF is it called an octave?
>
>
> On 18 August 2014 20:36, Bob Blick <bobblick@ftml.net> wrote:
>
>> An octave represents eight notes, not a factor of eight.
>>
>> Makes more sense than "flammable" and "inflammable" :)
>>
>> Bob
>>
>> On Mon, Aug 18, 2014, at 11:31 AM, David C Brown wrote:
>>> A decade is a factor of ten so an octave must be a factor of eight
>>> mustn't
>>> it?   Well, no it is actually a factor of two.   Why?   Very illogical.
>>> I know it is borrowed from musical theory where an octave is an interva=
l
>>> of
>>> seven notes.  Equally illogical
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