Renny wrote:It does make a difference, if I could remember my physics from almost 30 years ago, I could quote it. It does vary in direct proportion to the change in temperature IIRC.
Renny wrote:It does make a difference, if I could remember my physics from almost 30 years ago, I could quote it. It does vary in direct proportion to the change in temperature IIRC.
I have seen pressures vary by 3-5psi when one side of the car has been sat in the sun. Also between late summer and winter, or winter-spring tyres seem to vary by 2-3psi, even though they otherwise do not change.
The pressure is not going to double if the temperature goes from 10 deg. C to 20 deg. C.
SLine wrote:The pressure is not going to double if the temperature goes from 10 deg. C to 20 deg. C.
That's because the law works on the Kelvin scale.
If you checked your pressure in the summer, at 20 deg. C., and it was 26psi, and it was now freezing, the pressure would be about 24.2psi - assuming no other loss.
Mr Cholmondeley-Warner wrote:Not forgetting, of course, that the tyre will have expanded with the heat too, so the volume will be bigger, and the pressure increase correspondingly less...
Mr Cholmondeley-Warner wrote:You don't think materials expand as they get hotter?
Renny wrote:Mr Cholmondeley-Warner wrote:You don't think materials expand as they get hotter?
Have you seen the steel/nylon belts round a tyre carcass? They can defeorm, but not expand (unless they have structurally failed). Either way the change in volume will be proportionatly small.
Mr Cholmondeley-Warner wrote:Renny wrote:Mr Cholmondeley-Warner wrote:You don't think materials expand as they get hotter?
Have you seen the steel/nylon belts round a tyre carcass? They can defeorm, but not expand (unless they have structurally failed). Either way the change in volume will be proportionatly small.
OK, so you don't think steel expands as it gets hotter, either, then?
Yes of course it will be a small change (but then, so was the temperature induced pressure change)
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