Change In Tyre Air Pressure

slocjo | 21:03 Wed 12th Nov 2014 | Science

8 Answers

hello...CAN SOMEONE PLEASE TELL ME A ANSWER TO A QUESTION I HAVE..HOW MUCH DOES TYRE AIR PRESSURE CHANGE WITH THE TEMPERATURE (A) APPROX 0.2BAR/15C (B) APPROX 0.1BAR/15C (C) APPROX 0.1BAR/10C (D) APPROX 0.2BAR/ 10C Advance thanks..

Not Long Until Touchdown

Metal To Plastic

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Zacs-Master

Your question has a lack of data or parameters such as:
Temperature increase or decrease
The range of temperature you are talking about (from/to)
Size of tyres in question
Whether the vehicle is static or in motion (or a combination)
What the starting pressure is and whether it is standard for that tyre

bhg481

Zacs, I think you've misunderstood the question but there is still data missing.
I think the question is a multiple choice and you have to choose the correct answer from the 4 given.
Let's assume that the tyre is a normal car tyre, starting temp 20deg (=293 Kelvin) at a pressure of about 30psi = 2 bar and that the volume of the tyre doesn't change with increase in pressure.

We can now use Gay-Lussac's Law p1/T1 = p2/T2

p2 = (p1 x T2)/T1

for a 15 deg increase in temp we get p2 = (2 x 308)/293 = approx 2.1bar

the increase in pressure
is 2.1 - 2.0 = 0.1 bar for a 15 deg increase in temp.

Now see which of these options this agrees with and there's your answer.

slocjo

Question Author

Hello..sorry to you both ref. data.but that's how it was given.also the question (which I did,nt say) is truck related But I see bhg481 has come up with the right formula, well It ties up with one of the answers..so I go with that..thanks..

bhg481

Fine, but do you understand why?

slocjo

Question Author

no I don't understand .but for all I know you could be taking the *** but that's fine by me, your answer ties up so its good for me..needs to be in by tomorrow...