Tire Pressure Question?

motoxracer46 · Feb 3, 2009

me and a buddy had a little dispute over tire pressure....... so if you have a rig up on a hoist and check the tire pressure and it shows 35 psi then lower the rig back on the ground and check it again will the pressure be the same or will it show more????????:beer:

Glenn · Feb 3, 2009

How many beers did you bet? :beer:

nevada · Feb 3, 2009

i know the answer....but. ya, whats it worth?

:corn:

J_SIN · Feb 3, 2009

I would imagine it would show a slight increase.

pokey · Feb 3, 2009

It will be the same. Now a warm tire (after running on the road) will show a slight increse in presure as the air expands when heated. We also have learned that a tire full of air weighs more than a tire with no air:eeek:

82toyomud · Feb 4, 2009

motoxracer46 said:
me and a buddy had a little dispute over tire pressure....... so if you have a rig up on a hoist and check the tire pressure and it shows 35 psi then lower the rig back on the ground and check it again will the pressure be the same or will it show more????????:beer:

Is this a serious question?:eeek:

motoxracer46 · Feb 4, 2009

yeah it is a serious question you got the answer?

nevada · Feb 4, 2009

pokey said:
It will be the same. Now a warm tire (after running on the road) will show a slight increse in presure as the air expands when heated. We also have learned that a tire full of air weighs more than a tire with no air:eeek:

ding ding ding:awesomework:

82toyomud · Feb 4, 2009

motoxracer46 said:
yeah it is a serious question you got the answer?

Yes:fawkdancesmiley:
Any time you raise or lower something the pressure its feeling is going to change, but whether or not you can measure that change is a different story. For how far your moving the vehicle, no you won't see a change in pressure, but if you were to say go from sea level to denver then you would see a noticeable change in pressure...

82toyomud · Feb 4, 2009

nevada said:
ding ding ding:awesomework:

which part are you dinging? The fact that a tire full of air weights more than a tire without any air?

nevada · Feb 4, 2009

82toyomud said:
which part are you dinging? The fact that a tire full of air weights more than a tire without any air?

all of the above.

Pat · Feb 4, 2009

motoxracer46 said:
me and a buddy had a little dispute over tire pressure....... so if you have a rig up on a hoist and check the tire pressure and it shows 35 psi then lower the rig back on the ground and check it again will the pressure be the same or will it show more????????:beer:

One of you graduated high school and the other didn't?

dirtygoat · Feb 4, 2009

Is a tire lighter with negative air pressure???:redneck:

AMJ · Feb 4, 2009

Oh goody a tire air pressure question. You should really ask Travis :haha:

Boonie Buster · Feb 4, 2009

Pokey is right, the pressure will be the same but the actual tire weight will be much more than if it were empty...

Glenn · Feb 4, 2009

Boonie Buster said:
Pokey is right, the pressure will be the same but the actual tire weight will be much more than if it were empty...

Much? You've measured this?

Not Jobless · Feb 4, 2009

Air does in fact have weight, and it varies by temperature...

All you need to know, knock yourselves out :awesomework:

http://www.engineeringtoolbox.com/air-desity-specific-weight-d_600.html

64FJ40 · Feb 4, 2009

As others said, the pressure stays the same.

But, depending on which side of the argument you're on, you could potentially argue that the pressure would increase if enough weight were added to the axle being suspended. The temperature isn't changing. The number of air molecules doesn't change. There won't be any phase changes at the temperature and pressure you're dealing with. So in order to change the pressure, the volume must change. So it would have to be enough weight to exceed the elastic capacity of the tire and reduce the overall storage volume.

pumpy · Feb 4, 2009

OK if a semi left Los Angeles at 2:00 pm PST heading for Florida weighting 80'500 pounds, with 90 psi in each tire.
And another semi leaving Colorado at 5:00 EST heading for Toronto weighing 30'800 with 82 psi in the front tires and 78 psi in the rear tires.

The question is have you ever got hammered and argued with your friend about something pointless that you could have checked in the garage on you own, and then posting said argument?????