Talk:Thermal conductivity measurement

Standards

Would it be worthwhile to mention ASTM C518, ISO 8301, ISO 22007, or any other standard for making this measurement? -207.70.169.36 (talk) 18:40, 11 September 2009 (UTC)

I agree so I've moved the standards section from thermal conductivity to this page and added the mentioned standards.School of Stone (talk) 09:40, 15 April 2011 (UTC)

I think you should include the optical scanning method (Popov et al., 1999) It is close to becoming the industry standard. — Preceding unsigned comment added by 130.95.218.27 (talk) 09:32, 27 September 2011 (UTC)

Steady-state, not obvious how to understand it?

It says that steady state measurements are when the material does not change with time. This is how I understand it. The material is shaped like a cylinder. Is it? And each end, adjacent to the material, have a different temperature. Perhaps 0degrees at one end, and 20 at the other. Some electronics keep these temperatures steady. And in someway it is measured how much energy flows from the warm end to the cold one. Perhaps this measurement is done by measuring how much energy is spent on keeping the temperature at 20deg in the warm end, and how much on keeping it at 0deg in the cold end. What is around the materials. Are they jammed into a block of something with a very high thermal resistance.

Or is the cylinder just in vacuum? If in total vacuum and in outer space (or a sort of black body box) with no outer sources of radiation, Then the heat could only travel through the cylinder, right?

Anyway, with the setup described before with keeping one end at 0 and the other at 20, there is a heat gradient through the cylinder. How can the last line then mention having no gradient in the end of the test. No gradient means that the temperatures must change over time. And the definition of steady state is that it does not change over time.

MadsSkjern (talk) 11:00, 31 August 2015 (UTC)