So... theoretically speaking, then, since helium has an even lower
density than either nitrogen or regular air, then it would react the
least to temperature changes, right? AND, it would make your car lighter
cos it's helium! I may be onto something here... obviously hydrogen is
(the only thing) lighter than helium but most people associate hydrogen
with 'bomb' or 'hindenburg' so that wouldn't be a very good selling
point... helium tires? anybody?
Jason
Jon Heese wrote:
> Actually, you're forgetting one important point.
>
> The Ideal Gas Law says that for *any* gas:
>
> PV = nRT
>
> Where P = pressure, V = volume, T = temperature, n = number of moles
> of the gas and R = some garbage constant to make the units fit.
>
> So, looking at this equation, you can see that raising the temperature
> (T) of the system will raise the pressure (P) and/or the volume (V).
> The amounts of these two effects depends on the container, in this
> case, the tire, but at least one of them must increase to make the
> equation work.
>
> Now, the problem with your assertion that both "air" and nitrogen gas
> have the same delta(PV) given the same delta(T) is that you're
> assuming that the number of moles (n) of the two gases is the same.
> Thankfully for Jason Hartberger, air is more dense than nitrogen gas,
> meaning that V cubic centimeters of "air" contains more molecules than
> V cubic centimeters of nitrogen gas.
>
> So the theory that nitrogen-filled tires expand less under the same
> increase in temperature actually holds.
>
> Regards,
> Jon Heese
>
> Ron Childs wrote:
>> Also remembering maybe HS chemistry, all gases expand and contract
>> the same amount with the same changes in temperature or pressure.
>>
>> -Ron
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