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Posted by trader4 on January 31, 2009, 8:17 am
On Jan 31, 8:05=A0am, letter...@invalid.com wrote:
show/hide quoted text
> OK, I never believe all the BS on tv, but they just had a thing on tv,
> The Early Show) =A0about winter driving. =A0Most of what they said was
> right, but they said that cold weather takes air out of your tires...
> Ummmm, I dont buy that.....
> Yes, cold makes metal shrin, in fact I recall many years ago there was
> a long railroad bridge that shrunk so much in the cold that they had
> to shut it down and put supports under the ends because the ends were
> coming off the supports. and I have also seen the opposite in the
> summer when it gets real hot, long stretches of freeways will actually
> buckle because the concrete expands and has no where to go.
> With that in mind, I would assume the air volume in tires might also
> shrink, and the metal rim may shrink in a very small amount, but I
> dont see how it could "take air out of the tires". =A0At the same time,
> does air shrink in the cold? =A0I really dont know. =A0I just know that
> metals and concrete does. =A0Unless someone knows something different, I
> think this thing about tires losing air is false information. =A0What do
> you think, or know about this? =A0I'm curious now.
> LM
I'd say it's a sad reflection on the current state of education in the
USA. The effect is described in Charles Law, which goes back several
centuries. And the law is about gases and temp, not tires.
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Posted by Frank on January 31, 2009, 11:56 am
trader4@optonline.net wrote:
show/hide quoted text
> I'd say it's a sad reflection on the current state of education in the
> USA. The effect is described in Charles Law, which goes back several
> centuries. And the law is about gases and temp, not tires.
I agree but suspect a troll as his language command is adequate for
maybe a high school graduate.
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Posted by Andrew on February 1, 2009, 9:35 am
show/hide quoted text
> trad...@optonline.net wrote:
> > I'd say it's a sad reflection on the current state of education in the
> > USA. The effect is described in Charles Law, which goes back several
> > centuries. And the law is about gases and temp, not tires.
> I agree but suspect a troll as his language command is adequate for
> maybe a high school graduate.
The law in question here is called Boyles Gas Law. It states that:
PV=nRT
where:
P = pressure of the gas
V = Volume of the container
n = number of molecules of the gas
R = the universal gas constant
T = temperature
So, if temperature decreases, and all else stays the same, pressure
goes down proportionally.
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Posted by Frank on February 1, 2009, 11:50 am
Andrew wrote:
show/hide quoted text
>> trad...@optonline.net wrote:
>>> I'd say it's a sad reflection on the current state of education in the
>>> USA. The effect is described in Charles Law, which goes back several
>>> centuries. And the law is about gases and temp, not tires.
>> I agree but suspect a troll as his language command is adequate for
>> maybe a high school graduate.
>
> The law in question here is called Boyles Gas Law. It states that:
>
> PV=nRT
>
> where:
> P = pressure of the gas
> V = Volume of the container
> n = number of molecules of the gas
> R = the universal gas constant
> T = temperature
>
> So, if temperature decreases, and all else stays the same, pressure
> goes down proportionally.
I always get Boyles and Charles mixed up but what you state is the ideal
gas law which is easier to remember:
http://en.wikipedia.org/wiki/Gas_laws
Any high school graduate should a rough idea of
temperature/volume/pressure relationship of gasses.
It is also good to know that temperature is in degrees Kelvin and
difference between pressure in a hot and cold tire is only a few pounds.
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| Similar Threads | Posted | | Re: Cold weather takes air out of your tires | January 31, 2009, 8:25 am |
| Re: Cold weather takes air out of your tires | January 31, 2009, 10:19 am |
| Re: Cold weather takes air out of your tires | January 31, 2009, 10:11 am |
| Re: Cold weather takes air out of your tires | January 31, 2009, 12:14 pm |
| Re: Cold weather takes air out of your tires | January 31, 2009, 1:51 pm |
| Re: Cold weather takes air out of your tires | January 31, 2009, 6:56 pm |
| Re: Cold weather takes air out of your tires | January 31, 2009, 11:53 pm |
| Re: Cold weather takes air out of your tires | February 1, 2009, 12:03 am |
| Re: Cold weather takes air out of your tires | January 31, 2009, 11:59 pm |
| Re: Cold weather takes air out of your tires | February 1, 2009, 1:32 am |
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> The Early Show) =A0about winter driving. =A0Most of what they said was
> right, but they said that cold weather takes air out of your tires...
> Ummmm, I dont buy that.....
> Yes, cold makes metal shrin, in fact I recall many years ago there was
> a long railroad bridge that shrunk so much in the cold that they had
> to shut it down and put supports under the ends because the ends were
> coming off the supports. and I have also seen the opposite in the
> summer when it gets real hot, long stretches of freeways will actually
> buckle because the concrete expands and has no where to go.
> With that in mind, I would assume the air volume in tires might also
> shrink, and the metal rim may shrink in a very small amount, but I
> dont see how it could "take air out of the tires". =A0At the same time,
> does air shrink in the cold? =A0I really dont know. =A0I just know that
> metals and concrete does. =A0Unless someone knows something different, I
> think this thing about tires losing air is false information. =A0What do
> you think, or know about this? =A0I'm curious now.
> LM