"Dan Smith" > wrote in message
news:z2zee.58865$WI3.20397@attbi_s71...
>
> This is also what happens when you step on a balloon only you reduce the
> volume for a fixed amount of a gas (the air) by distorting the shape of
the
> balloon until the pressure is so great and the skin has stretched so far
> that some part of the skin of the balloon ruptures.

this is not correct...in the case of the balloon you are indeed distorting,
but the balloon stretches so the internal "volume' is unchanged...that is my
hangup....you seem to know what is going on, and you probably know your
original statement was a "stretch" to say the least, you are just trying
your damnedest to not admit it...

>
> When you add weight to a car you distort the shape of the tire. This
> distortion reduced the volume inside the tire. The tire stretches some to
> help keep the pressure differential reduced but it can't stretch enough to
> totally compensate so the pressure inside the tire increases.

there is no pressure increase.... you would have to overload the tire beyond
what was the subject at hand to *ever* decrease the inside
volume....period... you won't make the tire smaller...it will burst first...

>
> When you have a fixed amount of gas (in this case air) in a container (the
> tire) and reduce the volume of the container the pressure goes up. This
is
> why the tire pressure goes up as the weight it is supporting increases.

again you seem to have the theory, but you are still not quite there.... my
tires on my pu contain 50psi cold.....even when i slap a couple tons of
gravel on the back it still has 50psi cold.... this is not just me talking,
it is from training and actually measuring tire pressures...something you
have done neither of...


>
> You already admitted the shape of the tire distorts. Now all you have to
> wrap your brain around is the fact that when you distort the shape of the
> tire you also reduce the volume inside the tire and the pressure
increases.

distorting the shape has exactly NOTHING to do with it....if you load the
tire(which is so far from your original, yet brilliant, statement it apples
to oranges) the air is displaced locally in the tire...this causes the
pressure to move inside the tire...so localized inside the tire you could
have more pressure but the overall read at the guage is the same...wrap your
"brain"(yeah right) around that....or get educated on tires....

> I'm not going to go into the calculus supporting this. You're just going
to
> have to research that yourself.
>

no need....i breezed through calculus and "tire school"..... you can shove
your "opinions" based on **** you don't know about, or what you *think*
would happen, straight up your ass.... i have BTDT with the training and the
experience....