On Mon, 08 Jun 2009 15:36:48 -0400 Rich Thomas
<richthomas79td...@constructivity.net> wrote:

> Heat transfer (conduction) goes at the 4th power of the temp difference 
> over a distance,

Actually, it's radiation that goes as the 4th power; conduction is linear
with temperature.

> if you have a smaller path for heat to transfer (like 
> in a flattish fuel tank) it can go very quickly, in a big round tank 
> like a truck or dump it goes slowly.  (that does not account for 
> convection, i.e. swirling around, just conduction which is more 
> applicable in a big stable tank -- in a small tank it swishes around and
> warms up quickly from the tank sides).

A flatish tank has more surface area for the volume than a round tank.
That's why the contents heat up faster.


> Physics are fun.

Indeed.


Craig

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