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From: Geode on 18 May 2010 17:51
On 12 mayo, 23:25, Hawkman <worldspiri...(a)yahoo.com> wrote:
> On May 13, 12:36 am, Sam Wormley <sworml...(a)gmail.com> wrote:
>
> > "The value of the Avogadro constant was first indicated by Johann Josef
> > Loschmidt who, in 1865, estimated the average diameter of the molecules
> > in air by a method that is equivalent to calculating the number of
> > particles in a given volume of gas.[7]
>
> But how can molecules have a diameter if they are not circles? Only
> circular shapes have a diameter but molecules are not circular.

this is not an argument. It is not very relevant the exact form. The
idea of a diameter serves to simplify the concept, unless we had
reasons to believe the atoms were fusiform, or like bacilli.
Geode
..
From: Geode on 18 May 2010 18:04
On 13 mayo, 01:15, Darwin123 <drosen0...(a)yahoo.com> wrote:
> On May 12, 5:23 pm, Geode <leopoldo.perd...(a)gmail.com> wrote:> But I have never find a clear process to state this number.
> > Does anyone had read about it?
> > Geode
> > .
>
>       Here is determination using electrolysis and the electric charge
> of an electron.
>        The Faraday constant is the electric charge of 1 mole of
> electrons. It can be determined by using electrolysis. The amount of
> metal deposited on an electrode is proportional to the electric
> current times the time (which is electric charge). Faraday's constant
> is the proportionality for a monovalent metal. The Faraday constant
> was determined in 1834 to be experiment to be F=96485 C /mol. See the
> linkshttp://en.wikipedia.org/wiki/Faraday%27s_law_of_electrolysishttp://en.wikipedia.org/wiki/Faraday_constant
>          The Millikan oil drop experiment in 1909 determined the
> electric charge on a single experiment. The charge measured on a
> single electron is q=1.5924(17)×10-19 C. See the link:http://en.wikipedia.org/wiki/Oil_drop_experiment
>     Avogrado's number N can be easily determined by the simple ratio
> N=F/q
> The answer is
> N=6.022x10^23
>      I am sure there were other methods to determine an estimate of
> Avogrados number before 1909. However, I think this method is one of
> the simplest, conceptually.

I do not see how Millikan could had determined the charge of an
electron in relation to the general idea of charge. If the Avogadro
number was determined already at the time of the Millikan experiment,
it could be a lot easier to determine how many electrons made a unit
of electric charge. It is the same story more or less. How Faraday
determined a unit of charge, was needed first to determine how many
electrons were in a unit of charge.

I know that this would be alright, once you have the idea of the
number of Avogadro. Then you check, how much electricity I had spent
to deposit a certain mass of metal on an anode.

As I said, it is like a handmade lace. A little complex, specially if
you got not the crucial clue of this issue. There have to be one or
several concepts involved in the realization of the approximate
number. That is why the select the number 6 and not four. I would
like to know how they arrived at the precise number of 10^23 instead
of 10^18 or 10^26
So far, I had found only superficial accounts of the question as it is
now established.
Geode
..

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