Re: [Phys-l] glassware needed

["Anthony Lapinski" <Anthony_Lapinski@pds.org>]

I did. They are small and the water heats up quickly.

Immersion heaters are about 300 W. Use Pt = mcT. In theory, 1 L of water
at room temp reaches boiling in abut 18 min. A cup of water (about 0.25 L)
takes around 5 min. I wanted kids to graph temp vs time over an "extended
period, and then calculate the power of the heater and compare to the
actual value. I wanted a graduated container to easily measure the amount
of water.

So far, the Pyrex measuring cup is the best idea. The glass is thick, but
still works with the clip on the immersion heater. And the markings on
these 0.5 L and 1 L cups have metric markings. Have not checked heat loss
errors via the air/glass yet...

Forum for Physics Educators <phys-l@carnot.physics.buffalo.edu> writes:
> I must be something here -- why not use a coffee mug?
>
> bc obsessively collects them.
>
>
> On 2008, Dec 29, , at 09:34, Anthony Lapinski wrote:
>
> > Happy holidays everyone!
> >
> > I want to do a lab activity using a small immersion heater and a  
> > beaker of
> > water. However, our beakers all have the usual sloped tops with a  
> > spout.
> > The clip on the immersion heater is meant for a coffee cup with  
> > straight
> > sides, and does not secure well to the beaker. It will fit on a tall
> > graduated cylinder, but then it is difficult to mix the water to get a
> > good temperature readings.
> >
> > So I am looking for a straight sided beaker (graduated if  
> > available) to do
> > this experiment. I searched unsuccessfully on the interned, but  
> > only found
> > straight sided plastic beakers and jars. Nothing made of glass and
> > graduated.
> >
> > Does anybody know of a source/company for what I need? Thanks!
> >
> > _______________________________________________
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> > Phys-l@carnot.physics.buffalo.edu
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>
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