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Say a car tire requires 33 PSI to inflate.
One tire is on a car.
Another tire is not on the car.
As far as the air nozzle and compressor is concerned, does it take the same amount of pressure to fill each tire?
I ask the question because one of the tires is free, while the other tire has a lot of weight on it.
Thanks.
The tire with weight on it will require more pressure to be filled. Sams Laser FAQ - Ar/Kr Ion Laser Testing, Maintenance, Repair::
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Another way to look at this: If I pump the tire to a certain pressure, then deflect it inward by application of force, will the internal air pressure increase? The answer must be YES, which means that, technically, the unmounted tire should be slightly under-inflated. However, I have never seen any such recommendation from a tire manufacturer (and I'm obsessive about correct tire inflation). I conclude that the effect is small enough to ignore. Edited Hansard * Table of Contents * Number 066 (Official Version)::
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DUUUUUUDE your like stokin your brain!
your cuestion has a logic error and it goes like this:
wha'ts heavier a pound of rocks or a pound of feathers?
Duh. it's a pound in BOTH CASES!
What pressure is higher: a mounted tire at 33 psi or a free tire at 33 psi?
Duh its 33 psi in BOTH CASES!
what you SHOULD B askin is what takes MORE NRG to FILL?
or. maybe what takes more volume of air?
get it?
You asked "does it take the same amount of pressure...". Yes. Any source equal to or greater than 33 psi can be used to fill either tire to the 33 psi pressure. What you may be wondering is this: Does it take the same amount of energy to fill the tire? The answer is no, the tire with weight on it takes more energy to fill (although not much more). The reason is that the tire with weight on it has less volume initially and comes up to pressure faster, therefore more time is spent inflating the tire while it is under pressure. Because of this, the mounted tire will take longer to inflate for a given air pressure source, although it won't be noticeable unless your pressure source is only a few psi higher than the tire.
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Does it take the same amount of pressure to pump up a stand alone tire versus a tire on a car?