Re: SI units and QED

From: Old Man (nomail_at_nomail.net)
Date: 09/13/04 

Date: Mon, 13 Sep 2004 20:17:49 +0000 (UTC)

"Mike Helland" <mobydikc@gmail.com> wrote in message news:11990c07.0409101017.2d2c1523@posting.google.com...
> Hello,
>
> According to the book QED, the theory by the same name can explain
> light, heat, and electric phenomena.
>
> There are three SI base units that relate to these phenomena, measure
> of intensity, measure of temperature, and measure of electric current.
>
> I might be mistaken but I think that intensity is how many photons are
> received within a given time period, temperature is how fast the
> electrons of a substance are moving, and current is how many electrons
> are moving down a some conducter.
>
> Is it true that the three SI base units in question may be understood
> in terms of the movement of particles? In other words, can those three
> units be described in terms of the other base units?
>
> For example:
>
> if N photons are received in S seconds, the intensity is I cd
>
> if the electrons are moving at a V m/s the temperature of the
> substance is equal to T kelvin
>
> if N electrons pass through a conductor in S seconds there are X amps
>
> Are there any formulas for these conversions?
>
> I'm asking out of pure curiousity. I don't think that there are any
> real practical uses for these formulas, or for reducing the number of
> SI base units. Are there?

The distribution of molecular velocities, v, in a gas of temperature, T,
is given by a Maxwrll's distribution:

n(v) / n_0 = exp [- m v^2 / 2 k T ]

or approximately,

(1 / 2) m (v_ave)^2 ~ (3 / 2) k T

where k is Bolltzmann's constant.

The Stefan-Boltzmann law relates luminous intensity to temperature for
black-body radiation. Radiation energy flux (W / m^2)

P / A = w_b *T^4

Where w_b can be expressed in terms of fundamental physical constants,
h , c, and k.

Electric current and elementary charge are related to molecular mass via
precise electroplating experiments (Avogadro's Number).

[Old Man]

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