Re: [Phys-l] A physics lab with hypodermic needles

[bernardcleyet@redshift.com]

Really now, what's this w/ using sharp needles.  Cut the end off w/ a
jewler's saw (Ailable at hobby shops.), then smooth the end w/ a stone.  I
o this for refilling pens' ink cartridges, and one used to inject India
Ink into glass of water to show heating in a microw. oven did not mixing
contrary to a claim on PHYS-L.

bc kitchen physicist.

p.s. I'm just not reading carefully.  I thought it was a Zahn cup expt.

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

or something to do w/ Poiseuille.

http://en.wikipedia.org/wiki/Poiseuille's_law




> At 11:40 PM 5/30/2008, you wrote:
> > Several years ago I invented a physics lab where my students figured out
> > the
> > size of the hole inside a hypodermic needle.
CUT
> > Has anyone else tried something like this?  Do you think this is a good
> > lab
> > or not?  Is Œneedle safety¹ too big a worry for you?  Is there a good way
> > to
> > lessen the hazard of getting stabbed?
> >
> > Steve Highland
> > Duluth, MN
>
>
> It's the second stick that is the greater risk. Briefing the class to
> turn in a
> sharp that has nicked any skin at all, just once, for a replacement
> would be one
> hygiene measure.
>
>
> Brian Whatcott    Altus OK    Eureka!
>
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