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Re: Wolfram | Alpha: Acres per square mile? (oddities)

  • To: mathgroup at smc.vnet.net
  • Subject: [mg101201] Re: Wolfram | Alpha: Acres per square mile? (oddities)
  • From: pfalloon <pfalloon at gmail.com>
  • Date: Fri, 26 Jun 2009 06:53:30 -0400 (EDT)
  • References: <h1vm2n$a8q$1@smc.vnet.net>

On Jun 25, 9:12 pm, AES <sieg... at stanford.edu> wrote:
> Just out of curiosity (and a current need for info) (and to start
> learning about W|A), typed:
>  
>    Acres per square mile
>
> into Wolfram | Alpha. Results came back (had to do a little hand editing
> of the following):
>
>       Assuming U.S. acres for "acres"
>    Use
>       international acres
>       commercial acres
>       Irish acres
>       Hungarian acres
>    instead
>
>    Input interpretation:
>
>       acres/mi^2
>
>    Unit conversions:
>
>       0.3861 acres per square kilometer
>  
>       6.323 square meters per acre
>  
>       0.1563 hectares per square kilometer
>  
>       0.4047 hectares per square mile
>  
>       0.003861 acres per hectare
>
> Don't see "640" there anywhere! -- and something seriously wrong with
> that first unit conversion? (not to mention all the others) -- or at
> least the way it's phrased -- more like 250 acres per square kilometer?
>
> Went to M7, tried
>
>       Needs["Units`"]
>       Convert[Acre, Mile^2]
>
>             Mile^2/640
>
> Went to Units Tutorial:  Seems odd to see "Centimeter", "Meter",
> "Micron", "Mile", and a bunch of arcane units listed there -- but NOT
> "Kilometer"???  ("Gram" and "Kilogram" are in there).


W|A is interpreting your input as the dimensionless unit "acres/
miles^2", which isn't terribly helpful. To get the value of the ratio
the following seem to work:

"convert one square mile to acres"

"1 square mile / 1 acre"

P.S. You may have already done so, but you can/should submit this kind
of comment/suggestion in the "send us feedback" field at the bottom of
W|A page.


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