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

[M come Meteorite Meteorites]

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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