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

• To: mathgroup at smc.vnet.net
• Subject: [mg101146] Wolfram | Alpha: Acres per square mile? (oddities)
• From: AES <siegman at stanford.edu>
• Date: Thu, 25 Jun 2009 07:13:04 -0400 (EDT)
• Organization: Stanford University

```Just out of curiosity (and a current need for info) (and to start

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

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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