Re: Battery on the ground

On Sun, 23 Mar 2008 15:26:17 -0600, Lew Hartswick
<lhartswick@xxxxxxxxxxxxx> wrote:

Ned Simmons wrote:

On Sun, 23 Mar 2008 08:26:00 -0600, Lew Hartswick
<lhartswick@xxxxxxxxxxxxx> wrote:


engineman1@xxxxxxx wrote:

When I studied chemistry they told me taht H2SO4 and water were
soluble in each other in all proportions, also that a solution
cosisted of two substances that would not separate merely due to
differences in density.
Has any of this changed?

Engineman


Did "Chemistry" class ever explain how the ocean has different
layers of density that cause the sonor problems that are well
documented by submarines? I would think using your logic that
it would be one uniform solution. ????
...lew...


There are continuous inputs (e.g., rivers) and ouputs (evaporation) of
fresh water to and from the ocean which prevent it from ever reaching
equilibrium with respect to solutes, unlike electrolyte which is
thoroughly mixed before filling a battery.

Similarly, as a result of localized inputs and outputs of heat, most
bodies of water are also not in thermal equilibrium, as any swimmer
can attest. It seems reasonable that the same could be true of a
battery sitting undisturbed on a large heat sink (a concrete floor)
while air temp is fluctuating.

A-MEN!

Have you noticed this while wading in a foot of water, or swimming on
the surface over deeper water on a calm day?

The thermal conductivity of water is not much different than that of
concrete -- roughly 0.5 W /(m*K). HDPE is also in the same ballpark.
http://www.engineeringtoolbox.com/thermal-conductivity-d_429.html

Air is about 24 times less. A battery sitting on concrete surrounded
by air of different temperature will behave thermally about like a
block of concrete sitting on the concrete.


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