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Another arithmetic question

M

Muir hill 101

Member
I know you guys are smart enough to know how to this . If a 235/85/16 has 80 psi in it how much air is inside it or how many square inches is the inside of the air chamber?
 
Can't tell accurately. The dimensions given represent width, sidewall ratio, and rim diameter but those are all external dimensions. The air chamber internally would have to assume tire thickness.
 
What does 235/85/16 refer to? Are those the dimensions of a rectangular chamber? Are they in inches?

The volume of air in a chamber is constant regardless of pressure. But its mass can vary according to pressure and temperature. And it will expand to a greater volume when it is released from the chamber.

Volume is measure in cubic, not square, inches. If it is the volume you are looking to find.
 
More or less just trying to figure out about how much force Is inside the thing at 80 psi lots of questions that Im not sure how to answer. If there is 80 pounds per square inch inside that tire there must be quite a few square inches inside right or wrong ?
 
> More or less just trying to figure out about how much force Is inside the thing at 80 psi lots of questions that Im not sure how to answer. If there is 80 pounds per square inch inside that tire there must be quite a few square inches inside right or wrong ?

Yes, the total force exerted on the inner surface of the chamber is the surface area times the interior pressure. But that's not necessarily useful information by itself. What is it you're really trying to figure out?
 
> Not 100 percent sure how to answer that

If that's the case, then I suggest you STOP whatever it is you're thinking of doing. Pressure vessels are not something the average person should be designing. If that's what you're contemplating.
 
Guys. I think all hes trying to do is figure out how big of a bomb a 235/85/16 tire is with 80 psi in it.
AaronSEIA
 
> Guys. I think all hes trying to do is figure out how big of a bomb a 235/85/16 tire is with 80 psi in it.

Ah. Maybe he'll tell us why now.
 
I am not sure why anyone would worry about that or need to know .
maybe worry more about the smoke that is in the air from Canada
 
If you want to blow it up and wonder if it will do damage. I can attest to the amount of force on a semi tire with about 80 psi when it blew. I was standing against it and the opposite side blew out. I was set back 4 ft and sat on a snow blower. The other side had a shelf full of tools. Blew out the drywall and dented the tin on the outside of the building. Nothing left on the shelf for 6-8 ft. I weigh 270 lbs and if my side would have blow I think I would have been seriously hurt. Never again fill a tire within 8 ft of it. Always laying flat and not standing. Thats all Im saying
 
Let's see ..... hmmmm ...... OK I got it. Looks like 25,568,000 cubic units of some kind. Just multiply those 4 numbers in the post and that's what I get. But what cubic units? Cubic centimeters or cubic inches? That depends on where you live, cubic centimeters north of the 49th parallel and cubic inches south. But they're not the same, cubic inches are bigger. Yes but so is the USA's GNP bigger, it is what it is and it a cancels out.
 
I don't have the knowledge to answer your question but I can tell you a 225/75/15 with 80#s aor on it can do allot of damage when it blows. I found out the hard way a couple weeks ago on my 5th wheel camper.
 
Guess my fat finger hit the o instead of a i. Should have said 80lbs of air in it. I never have figured out how to make a correction to a post.
 
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