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# Re: [Phys-l] Fun/cool unit conversion example?

The context appears to indicate gauge refers to shot size.

"... By contrast, shotguns are usually measured by "gauge," which is the weight, in fractions of a pound, of a lead round shot the same internal diameter as the barrel."

http://en.wikipedia.org/wiki/Shotgun_shell

not field theory

"In physics, gauge invariance (also called gauge symmetry) is the property of a field theory in which different configurations of the underlying fundamental but unobservable fields result in identical observable quantities. A theory with such a property is called a gauge theory. A transformation from one such field configuration to another is called a gauge transformation.[1][2]"

http://en.wikipedia.org/wiki/Introduction_to_gauge_theory

bc initially confused by barrel (large liquid container?), and thanks JD.

p.s. calling shotgun:

http://www.shotgunrules.com/

On 2010, Jan 19, , at 07:23, chuck britton wrote:

From the url given by JD:

"The gauge number is intended to be the number of lead balls per
pound, the balls being of a size that will just fit into the barrel."

That word 'gauge' has TOO MANY meanings ! ! ! ! !
Why can't it be INVARIANT ! ! ! ! ;-)

At 4:48 AM -0700 1/19/10, John Denker wrote:
On 01/18/2010 05:21 PM, curtis osterhoudt wrote:

Specific gravities: Pb ~ 11;

... from which you can calculate the bore diameter of
a 12-gauge shotgun.
http://www.unc.edu/~rowlett/units/scales/shotguns.html
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