[meteorite-list] fukang (the neverending thread)/what countryisthe hardes...

From: M come Meteorite Meteorites <mcomemeteorite2004_at_meteoritecentral.com>
Date: Fri Jan 6 14:13:23 2006
Message-ID: <20060106191320.16136.qmail_at_web26204.mail.ukl.yahoo.com>

here the humidity its at 63-70%...see you the big
difference

Matteo

--- MexicoDoug_at_aol.com ha scritto:

> Hi Marcin and Matteo - Tropical refers to latitude,
> and humidity refers to
> weather. They are independent. 0 humidity exists
> only in outer space...or on
> the Moon, etc...even the driest deserts are in the
> 10% relative humidity
> range.
>
> BUT! Air doesn't get more than about 4% absolute
> humidity anywhere, I
> recall. That's the most vapor than can actually be
> put into the air
> percentage-wise. So, in a sweltering hot place,
> with a disturbing 62% RELATIVE humidity,
> there is less than 2.5% absolute humidity, but if
> you cool it down it rains.
> So in the tropics you get lots of rain in the late
> afternoon - and rapid
> fluctuation in temperature cause condensation and
> precipitations. Matteo didn't
> say relative humidity so if we willingly generously
> gave him the benefit of
> the doubt, we can assume he meant absolute or
> specific humidity. Venice may
> be all wet, but so it Antarctica, in a sense.
>
> Arizona is does have higher temperatures, but it is
> not any more tropical
> that the frequently brutal temperatures of Death
> Valley, California (which does
> team with life)... and the driest places on Earth
> include the polar desert
> "Valley of the Dead" (Taylor Valley) of Antarctica
> and the Gobi desert, the
> later having average temperatures below zero! One
> factor additionally to
> consider in a desert is the radiative effect for an
> iron meteorite being baked in
> the sun with a dark magnetite layer ... it gets hot,
> and so does the air
> immediately around it!
>
> When we heat things up to dry them out...it is not
> principally the "heat"
> doing the drying on the object. It is the elevated
> temperature of the air
> around the object sucking the water out of the
> object because of the equilibrium
> being pushed increase the total amount of water the
> air holds, and the air
> "attracts" the water just like a vacuum would...
>
> Add to that, rusting happens what, twice as fast for
> every 10 degrees C
> increase in temperature?...and it is easier to
> relate to the comments on some of
> the stability of Russian irons...
>
> Relative humidity is not easily comparable from one
> location to another
> without considering the temperature. You compare
> them in a Mollier Diagram and
> answer almost any humidity-saturation-water
> concentration question looking at
> one. The warm the ambient temperature, the more
> water vapor that the air
> holds until it gets saturated. 30% relative
> humidity IS less water in a colder
> place than a warmer place that has the same 30%
> relative humidity.
>
> Does this make sense? Part is intuition but part is
> somewhat
> counterintuitive...but to understand the crux of
> what happens to preserve meteorites
> exposed to the air or even soil, these processes are
> the ones to mull for the
> environments.
>
> Saludos, Doug
>
>
> 1/6/2006 9:20:33 A.M. CST Matteo writes:
>
> >not sure from me....a person live in Arizona have
> a "
> >little " difference on humidity from one live in
> >Venice....
>
> Matteo
>
>
> 1/6/2006 7:56:57 A.M. CST, Marcin writes:
>
> > Right, I have many pieces of Seymchan and never
> seen a
> > trace of rust. And Russia is not a tropical land
> where
> > the umidity its near the 0. The same for Esquel
> and
> > Imilac, super stable pallasite.
> > Matteo
>
> Matteo, how in Tropical climate humidity can be 0 ?
>
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Received on Fri 06 Jan 2006 02:13:20 PM PST