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Re: Pounds and Kilograms

  • To: mathgroup at smc.vnet.net
  • Subject: [mg103641] Re: [mg103613] Pounds and Kilograms
  • From: "David Park" <djmpark at comcast.net>
  • Date: Thu, 1 Oct 2009 06:38:01 -0400 (EDT)
  • References: <12062492.1254302074540.JavaMail.root@n11>

It appears that WRI has divided units of mass into two groups, one that they
call mass and one that they call weight. They have the same BaseSI units.
WRI does not give us definitions of the units. I think the ones they call
weight are defined by measuring the force at the surface of the earth and
dividing out the acceleration of gravity. Otherwise, it is a little
confusing that the units of mass have been divided into two different lists.

If you want units of force use KilogramForce, Poundal or PoundForce.

Needs["Units`"]
Needs["PhysicalConstants`"]

Convert[Pound AccelerationDueToGravity, PoundForce]
1. PoundForce


David Park
djmpark at comcast.net
http://home.comcast.net/~djmpark/  


From: Kevin J. McCann [mailto:kjm at KevinMcCann.com] 


The Units Package has Pounds and Kilograms. Pound is listed as a unit of 
weight, Kilogram as a unit of mass; however,

Convert[Kilogram,Pound]

2.20462 Pound

Seems inconsistent. (I hate units.)

Kevin




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