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.