Re: [Phys-l] turn up the heat

["Carlos Alberto Vasquez" <carlosalbertovasquez@yahoo.com.ar>]

Dear Anthony: A lot of years before, I worked calibrating a Platinium 
resistence thermometer with aa accurity of 0.01 C, to do this I check two 
points with Hg thermometers, with a precison 0,1 C, but the real figure was 
1 or 2 degree!! above the 0 C in ice-water mixture (realy is very dificult 
to be sure that it is the ice melting point, using of course, destiled 
water). So, I think that the diferences between Hg and alcohol thermometer 
are negilible because the calibration is the more problematic problem.
Sorry by my bad english, I hope that it will be usefull for you.
Carlos
Lic. Prof. Carlos Alberto Vasquez
Teléfono Part.: 54 (011)47516376
Tel.Celular.: (011) 1559336148
e-mail: vasquez@gl.fcen.uba.ar
e-mail: carlosalbertovasquez@yahoo.com.ar

----- Original Message ----- 
From: "Anthony Lapinski" <anthony_lapinski@pds.org>
To: <tap-l@lists.ncsu.edu>; <tap-l@lists.ncsu.edu>; 
<phys-l@carnot.physics.buffalo.edu>
Sent: Sunday, February 12, 2006 11:24 PM
Subject: [Phys-l] turn up the heat


> I was reading Jewett's "The World Of Physics," and came across something
> on page 178. He states that a mercury thermometer reads accurately when
> just the bulb is immersed, while an alcohol thermometer only reads
> accurately when the ENTIRE thermometer is in the liquid. I was intrigued
> by this idea. His explanation is that mercury is a metal and a good
> conductor, and the column reaches a uniform temperature quickly; this does
> not happen with an alcohol thermometer, which is why the entire thing must
> be immersed, or else the column expansion will not be consistent with the
> calibration of the thermometer.
>
> This makes some sense to me. However, thermometer bulbs are made of very
> thin glass, so I thought that immersing just the bulb will always do the
> job -- no matter what type of thermometer is used. The thick glass on most
> of the thermometer is a poor conductor anyway. Many schools are getting
> rid of their mercury thermometers for safety reasons. Is it really true
> that the widely-used alcohol thermometers should be fully immersed for
> accurate readings?
>
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