On Thu, 28 Jul 2005 07:57:40 +0100
danube > wrote:

>
> > Anybody got numbers for the specific heat, thermal conductivity, and
> > density of popular ceramics?
>
> If you are worried about heat retention of a vessel, and you want to keep
> the heat within the teapot for a long time, go for a thermoflask, made of
> glass (it will be coated with reflective aluminium layers within the
> vacuum space).


I prefer stainless steel vacuum bottles. Which i also pre-heat.

Why? More durable, and if you get the Thermos-Nissan variant, superior
vacuum anyway. There is thermal contact at the neck, but not very much.