Thermal conductivity of glass

[ivylim88]

Uhmm.. i faced some problem with my experiment of finding the thermal conductivity of glass..i hope that someone can help me.
May i know the extimation of the thermal conductivity of a boiling tube??
isit the same as the thermal conductivity of pyrex glass??
when i want to find the radius of the boiling tube, should i take the reading of the external diameter divided by 2 or the internal diameter divided by 2??
and about the thickness of the boiling tube, its the external diameter deduct the internal diameter then divided by 2 isit??
i will really appreciate your help..

 

[phinds]

May i know the extimation of the thermal conductivity of a boiling tube??

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Not unless you specify the material and the thickness.

isit the same as the thermal conductivity of pyrex glass??

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I don't know since you don't say what it is.

when i want to find the radius of the boiling tube, should i take the reading of the external diameter divided by 2 or the internal diameter divided by 2??

[/QUOTE]
Which one do you think?

and about the thickness of the boiling tube, its the external diameter deduct the internal diameter then divided by 2 isit??

Yes, it is. OR ... you could just measure the thickness with a micrometer.