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

  • To: mathgroup at smc.vnet.net
  • Subject: [mg101202] Re: Wolfram | Alpha: Acres per square mile? (oddities)
  • From: "Hans Michel" <hmichel at cox.net>
  • Date: Fri, 26 Jun 2009 06:53:41 -0400 (EDT)
  • References: <h1vm2n$a8q$1@smc.vnet.net>

Try

"acre mile^2"

This query returned the requisite 640 you are looking for.

According to article about W|A http://www.technologyreview.com/web/22834/ 
Mr Weisstein put some work into the Unit part.

Hans


"AES" <siegman at stanford.edu> wrote in message 
news:h1vm2n$a8q$1 at smc.vnet.net...
> 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).
> 



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