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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..