[Robotgroup] Something to ponder ... thinking about dust storms

[Def Egge]

;-)  And of my household dustmites!

All the best....

Mike



At 11:09  2008-03-08, you wrote:
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 >Well, since you are on this line of computation, try and compute 
the
 >average
 >amount of flesh that falls off the average adult in one year, then
 >compute
 >for the household, then compute how much you breath in on average 
:) A
 >
 >favorite of mine :)
 >
 >Andre'
 >
 >
 >----- Original Message -----
 >From: "Def Egge" <robodigest at innervate.com>
 >To: "The Robot Group" <robotgroup at puremagic.com>
 >Sent: Saturday, March 08, 2008 10:16 AM
 >Subject: [Robotgroup] Something to ponder ... thinking about dust
 >storms
 >
 >
 >
 >I was watching a line of dust storms over the northwestern horizon 
a
 >few weeks back.  I got to thinking about the mass of dust suspended
 >in the air and how much soil was being lost on an areal basis.
 >
 >Assume that only the thickness of a sheet of typing paper (0.0097 
cm)
 >becomes airborne.
 >
 > From each 1 acre (4046.856 m^2 = 40468560 cm^2) of bare soil,
 >(0.0097 cm x 40468560 cm^2 = ) 392545.032 cm^3 of soil is removed.
 >
 >Further assume that the average bulk density of soil = 1 gm / cm^3
 >(actually, that is a bit low for fine textured soils more likely to
 >become airborne ... 1.1 gm / cm^3  - 1.5 gm / cm^3).
 >
 >That means that 392545.032 gm (392 kg) of soil is removed per
 >acre.  392 kg x 2.2 lb / kg = 863 lbs (probably 950 lb - 1300 lbs) 
of
 >soil removed per acre.
 >
 >YMMV.  As Mark Twain is quoted, "There is something fascinating 
about
 >science.  One gets such wholesale returns of conjecture out of such 
a
 >trifling investment of fact."
 >
 >
 >--
 >
 >All the best....
 >
 >Mike
 >
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