> Well I was not worried about the mixed units (some of us kiwi's are
versatile in
> this respect - you would not want to see the uproar in the UK at the
moment
> about having to sell meat and produce in kilograms instead of pounds
weight). I
> used to tell people the property I used to own in Auckland was an acre
plus 10
> sq m. if they did not mind mixed units. Most did not know what I meant.


I know you know this, but ... :-)

Selling meat in kg is, of course, wrong.
Meat should be measured in Newtons!
kg is a measure of mass.

When meat was/is sold in pounds that was a unit of force.
As (most*) measure force and not mass, pounds and Newtons are the correct
measure.
* - I have never seen a scale which measure mass by measuring moment of
inertia or similar. The space shuttle has such a device for measuring the
mass (weight?) of its crew members).

Perhaps the British public should be informed that they SHOULD have been
selling meat measured in slugs all along (weight = g x mass. 1 slug mass
weighs 32 pounds force).

I know we (almost) all know this.
It has interested me that in the imperial system we commonly use the unit of
force for measures of both mass and force whereas in the metric system we
use the measure of mass for measures of both mass and force.



    Russell McMahon

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