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Convert 17 926 369 Pascals to weight.
 

Convert 17 926 369 Pascals to weight.
by chronic on 09/24/03 at 23:19:09

Is there any way to convert 17 926 369 Pascals into grams?? I am very stumped on this, I dont know how to do it. Could some one please help me. It's very important.


Re: Convert 17 926 369 Pascals to weight.
by Robert Fogt on 09/25/03 at 01:07:55

Pascal is pressure, and there is no direct conversion to mass.

It would depend on the circumstances. Can you provide more information as to what you are trying to do?


Re: Convert 17 926 369 Pascals to weight.
by chronic on 09/25/03 at 12:57:16

Sorry, I realized after I posted it that isn't what I wanted to know, I got confused.
I'm trying to figure out the weight of compressed air in a bicycle tire tube. Say the tire tubes dimensions were 2.5" by 26" and there was 40 psi of air in the tire. I have been trying to figure out how much that would weigh. I'm a trials rider, I want to find out if my theory is correct or not. When I pump up my tire from 30 psi to 50...people say I'm a moron for thinking this, but I can tell a weight difference. The feel is different of course, but it's weight I can feel too. I was wondering if you could help me out with that?


Re: Convert 17 926 369 Pascals to weight.
by Robert Fogt on 09/25/03 at 16:28:03

Well I can probably help with that, but its unlikely you will like my answer. I don't think you can tell the difference in weight.  I think the difference you feel is the ride only.

un-pressurized air is 1.0 atmospheres
30 psi is about 2.0 atmospheres
50 psi is about 3.4 atmospheres

Going from 30 psi to 50 psi is an increase of 1.7 times. (3.4/2.0 = 1.7)

That means the weight of air in your tire is 1.7 times greater at 50 psi then at 30 psi.

Now, just to calculate the weight of air in your tire. Un-pressurized, at 1.0 atmospheres, at sea level, at room temperature, air weighs about 1.25 grams per liter. And according to a bike tire site I visited, a typical mountain bike holds 3 liters of air.

So the weight of air on a:
flat tire: 1.25 * 3 = 3.75 grams
30 psi: (1.25 * 3) * 2.0 = 7.5 grams
50 psi: (1.25 * 3) * 3.4 = 12.75 grams

The difference: 12.75 - 7.5 = 5.25 grams

A penny weighs about 2.75 grams. So pumping your tire from 30 to 50 psi is only a difference of less than 2 pennies.

Though lower inflated tires give a smoother ride. It is most likely you feel that.  It is unlikely you can tell the weight difference of two pennies.


Re: Convert 17 926 369 Pascals to weight.
by chronic on 09/25/03 at 18:48:36

Alright, Thank you very much for that. It's good to know now. I understand how lower pressure gives you a totaly different feel, I always have about 30 psi in my tires for grip and what not. But I was so sure there was a weight difference because hoping upwards on tires with 50 psi seemed more difficult, Maybe it's the bounce of the lower air pressure that gives me that extra push.
Again, thank you very much.


Re: Convert 17 926 369 Pascals to weight.
by Robert Fogt on 09/25/03 at 20:26:30

Your arms could also be really tired after all that pumping.  ;)

I am not much of a rider myself, so I could be wrong about how noticable 5 grams of weight is.  Just compared to the weight of the bike, 5 grams is probably nothing.  It may be alot of weight to a dart player, just not to a bike rider. Unless you're really attuned to your bike or riding.

Perhaps as an experiment, tape a coin to your forks and see if you can tell a difference. Or lightly tape it someplace hidden, and see if you can tell when it falls off.


Re: Convert 17 926 369 Pascals to weight.
by Steve on 10/23/03 at 08:56:12

Not that it changes the answer, but the tire gauge probably measures in psig.
1 atmosphere = 14.7 psia = 0 psig, so 30 and 50 psi are approx. 3 and 4.4 atm. respectively.


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