I want this settled

[BansheeBoy17]

All I want to know is "Do tires weigh more when inflated with air" A few of my buddys are arguing that they dont, even when I have found evidence online and calculations, that they DO weigh more.

 

- air weighs about 7.5 lbs per 100cf. (wtf is a cf? )

- for every 20psi, 1lb is added to the weight.

 

The way I see it - EVERYTHING has to weigh something, something cant weigh nothing. How come when people ship tires they let all the air out?

 

Lets see what you guys have to say, I'm not saying I'm right, I just want to know the facts about this unsolved mystery.

[kenr74]

Of course air has a weight. I am assuming "CF" is cubic feet.

[Cotton eyed Joe]

Heres the thing....

 

A tire with air will weigh more than a tire that is expanded to the same volume as the air filled tire, that is "filled" with a vaccuum.

 

You would have to get both tires to the same volume to make it even. Thats why Zepplins where filled with Hydrogen back in the day. Its the next best thing to a vaccuum, but a vaccuum is really really fucking hard to maintain when you are also trying to maintain a shape.

Thats what gives the items bouyancy in air. They displace their weight in air. If a tire displaces the same volume as any other tire, but by some magic force maintains a perfect vaccuum, it will weigh less. Not by much though.

 

All matter has weight whether or not it has a name such as "air" or "hydrogen". If it has mass, it will have a weight, or a more proper term would be inertia.

[PUSH THE THROTTLE]

I think the reason people ship tires deflated is so that they are smaller not because of weight. Anything with a density has a "weight" but I'd consider air in a tire negligible on the scale of an atv tire.

[helldriver]

air dont weigh anything

 

i go scuba diving and the air tanks have some much air pressue in them,, but you cant feel the air when its in the tank

 

 

so why would air in a tire weigh more?

 

think about it

Edited January 4, 2006 by helldriver

[04ShEeLE]

I think the reason people ship tires deflated is so that they are smaller not because of weight.

455068[/snapback]

 

 

They ship tires deflated because if they are ever on a plane or under any different atomspheric pressure, air either expands or contracts. If a tire was filled to like 35 psi at sea level, then at 30,000 feet in an airplane it might be at like 70 psi.

[PUSH THE THROTTLE]

They ship tires deflated because if they are ever on a plane or under any different atomspheric pressure, air either expands or contracts.  If a tire was filled to like 35 psi at sea level, then at 30,000 feet in an airplane it might be at like 70 psi.

455074[/snapback]

That too it's a good idea to not ship anything that's pressurized.

[Wallrat]

Gasses of any type have a weight. Take a look at the periodic table - at the very bottom of each element is that element's atomic weight measured in atomic mass units (AMU's). Hydrogen has the lowest weight at 1.008 AMU whereas something like Radon is much heavier at 222 AMU. The more pressure that the vessel has, the more it will weigh. That's because your cramming more molecules into a given volume. We use large compressed gas cylinders at my work and I can easily tell if a bottle is empty or full. I can hoist an empty one onto my shoulder no problem, with a full one I try to roll it whenever possible. Something as small as a tire holding as little as 5psi isn't gonna weigh a whole lot more. You won't see any gains in performance if anyone out there is thinking of filling their tires with hydrogen - all you'll get is 4 bombs bolted to your bike.

[Gargamel]

air dont weigh anything

 

i go scuba diving and  the air tanks have some much air pressue in them,, but you cant feel the air when its in the tank

so why would air in a tire  weigh more?

 

think about it

455072[/snapback]

 

 

You can't feel the difference because it's not much. But if you are a non believer then weigh that tank empty then again full, it will gain weight.

 

everything has a "weight" wether it's less then air or more then air. That will determine if you could "feel" the difference.

 

I love physics

[PUSH THE THROTTLE]

When you fill a paintball CO2 container you can easily tell a difference but then again good old PV=nRT plays a little role in that.

[locogato11283]

just make sure when summer rolls around you replace the cold winter air with new warm summer air...

[helldriver]

You can't feel the difference because it's not much. But if you are a non believer then weigh that tank empty then again full, it will gain weight.

 

everything has a "weight" wether it's less then air or more then air. That will determine if you could "feel" the difference.

 

I love physics

Edited January 4, 2006 by helldriver

[batoutofshell]

just make sure when summer rolls around you replace the cold winter air with new warm summer air...

455124[/snapback]

also don't forget to replace the powerband and muffler bearings for summer riding too.

[FasterThanU90]

also don't forget to replace the powerband and muffler bearings for summer riding too.

455177[/snapback]

 

and ur gonna need to replace the headlight fluid for sure

[banshee04le]

well i aint no physics  major

 

all I know is if air does have  weight, it aint a hell of a lot,,,,

455152[/snapback]

The weight of our atmosphere at sea level is 14.7lbs per square inch. This is pressure but it is pressure from static weight of air.

 

1 cubic foot of air at standard temperature and pressure assuming average composition weighs approximately 0.0807 lbs. Anybody want to see the math on that?