Re: Why isn't water used as a thermal-insulation?


Brablo wrote:
> Greg:
>
> Very interesting and a great point. Are there any known relations
> between specific heat and thermal conductivity? Also, what is the
> world's best insulator that you're aware of? It sounds like air is!

Vacuum is even better. Did you ever see a demonstration involving
liquid nitrogen? Liquid N2 is at 77 Kelvin (-196 C, -321 F). But it
can stay in an open container for hours without boiling away.
Those containers, called "dewars", are built like thermos
bottles, with glass, a reflective layer, and a layer of vacuum.

- Randy

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