Do I always have to write "self." ?
charleshixsn at earthlink.net
Thu May 4 16:06:46 EDT 2000
I don't really recall, h_bar may indeed be a dimensionless quantity. There
are a few of them. But c has the dimensionality of velocity (i.e., delta d
/ delta t). Exactly which units you choose to use are up to your
convenience. If you choose them appropriately, c will equal 1 * (3,000,000
m)/(1 year), which specifies the ratio that your units must have in order
for the value of c to equal 1.
Andrew Dalke wrote:
> Samuel A. Falvo II wrote:
> >*I* don't think
> >Hungarian is nasty -- I see it as a tool a programmer can use to keep
> >straight in his head, and on paper, precisely as a Physicist would use
> >to keep things straight in his/her head.
> But particle and nuclear physicists (at least) don't use units :)
> There are a couple of notations where basic physical constants are
> set to 1, eg:
> c == speed of light == 1
> h_bar == planck's constant/(2 pi) == 1
> This reduces the need for carrying around a lot of extra constants,
> like c**3/h**2. When the calculations are finished, you then say "and
> because the final terms must be units of spam, we add eggs**3/viking".
> dalke at acm.org
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