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Jonathan E. Hardis
jhardis at tcs.wap.org
Wed May 20 07:03:19 EDT 2015
I stand by my original statement. The label on the box is a mass specification, not a force specification. See the reference provided.
If you want to pick at the statement you would have to resort to relativity, in which case I would correct to "rest mass."
Sent from my iPad
> On May 20, 2015, at 1:51 AM, Poul-Henning Kamp <phk at phk.freebsd.dk> wrote:
> In message <32C69001-DB69-46C4-905F-D994B017B17F at tcs.wap.org>, "Jonathan E. Hardis" writes:
>> That box of Wheaties that is labelled 'Net Weight 10 oz' would
>> correctly weigh 10 oz everywhere on Earth, on the Moon, and on the ISS.
> It does not.
> For several reasons, but mainly because the enclosed air changes
> means that the bouyancy depends on air-pressure and thus altitude.
> That goes for anything which isn't enclosed by a rigid container
> with neglible elasticity in the range of relevant air-pressures.
> Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
> phk at FreeBSD.ORG | TCP/IP since RFC 956
> FreeBSD committer | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by incompetence.
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