Gunther, (01)
Maximum allowable temperature is a disposition of the object.
The object may reach never reach that temperature, or may reach it, even
exceed it, but that does not have much, in itself, to do with the property. (02)
The property is something like: other things being equal, if you stay below
this temperature the object (more often, a type of object) will operate as
specified - if you go above it then it may not. (03)
(Allowable is probably not the best example, as one could try and cash this
out by saying that one is defining two states that the object can be in -
below (or equal) to the maximum and above the maximum. But that would ignore
the intention that staying within the 'allowable' range should provide some
guarantee of normal operation.) (04)
So, the object has (or does not have) this property whatever its actual
temperature. (05)
I suppose one could argue that these are not quantities at all - but then (I
am told) most useful engineering measures would be excluded. (06)
Regards,
Chris Partridge
Chief Ontologist (07)
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> -----Original Message-----
> From: uom-ontology-std-bounces@xxxxxxxxxxxxxxxx [mailto:uom-ontology-std-
> bounces@xxxxxxxxxxxxxxxx] On Behalf Of Gunther Schadow
> Sent: 29 September 2009 21:51
> To: uom-ontology-std
> Subject: Re: [uom-ontology-std] What is mass?
>
> Matthew West wrote:
> > Dear Ingvar,
> >
> > This sounds like an interesting challenge.
> >
> >> I am as aware of the contents of VIM as of the SI brochure, and
> >> your
> >> "n.b." makes exactly my point. What you might call "newton-meter as
> >> a unit
> >> alone", I prefer to call "nominal newton-meter". However, note that
> >> only
> >> some units can be called nominal units and tied to more than one
> >> kind-of-quantity; many units are unambiguously tied only to one
> >> kind-of-quantity.
> >
> > Could you give me a unit (or two) that you think only applies to one
> > kind-of-quantity, and I'll see if I can identify another?
> >
> > Engineering is full of things like Maximum Allowable Working
> > Temperature, which is certainly not a temperature (try measuring it with
> > a thermometer).
>
>
> Why is maximum allowable temperature not a temperature? Just because
> it isn't realized? It is a temperature specification. It is a quantity
> even if it doesn't exist anywhere at any particular moment in time.
>
> But of course that is another issue and I still agree that a maximum
> allowable temperature of this machine can not be well compared with
> the water temperature of my pool -- but then they can if the machine
> is meant to go into my pool (which I don't have)
>
> -Gunther
>
>
> --
> Gunther Schadow, M.D., Ph.D. gschadow@xxxxxxxxxxxxxxx
> Associate Professor Indiana University School of Informatics
> Regenstrief Institute, Inc. Indiana University School of Medicine
> tel:1(317)423-5521 http://aurora.regenstrief.org
>
>
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