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- Q494390 subject Q8280244.
- Q494390 subject Q8854154.
- Q494390 abstract "Cold inflation pressure is the inflation pressure of tires before the car is driven and the tires warmed up. Recommended cold inflation pressure is displayed on the owner's manual and on the placard (or sticker) attached to the vehicle door edge, pillar, glovebox door or fuel filler flap. Drivers are encouraged to make sure their tires are adequately inflated, as suboptimal tire pressure can greatly reduce fuel economy, increase emissions, increased wear on the edges of the tire surface, and can lead to premature failure of the tire. Excessive pressure, on the other hand, will lead to blowouts, decrease braking performance, and cause uneven wear (i.e. greater wear on the inner part of the tire surface).Tire pressure is commonly measured in psi in the imperial and US customary systems, bar, which is deprecated but accepted for use with SI or the kilopascal (kPa), which is an SI unit.Ambient temperature affects the cold tire pressure. Absolute cold tire pressure (gauge pressure plus atmospheric pressure) varies directly with the absolute temperature, measured in kelvins.From physics, the ideal gas law states that PV=nRT where P is absolute pressure, T is absolute temperature (Kelvin), V is the volume (assumed to be relatively constant in the case of a tire), and nR is constant for a given number of molecules of gas. To understand this, assume the tire was filled when it was 300 kelvin (80 degrees Fahrenheit). If the temperature varies 10%, i.e. by 30 kelvin (also 30 Celsius degrees or 54 Fahrenheit degrees), the pressure varies 10%. So if the tire was filled at 80F to 32 psi (or 47 psi absolute when we add atmospheric pressure), the change would be 4.7 psi for this 30 Celsius degree change, or .16 psi per Celsius degree or .1 psi per Fahrenheit degree or 1 psi for every 10 Fahrenheit degrees. Using SI units, that would be 1.1 kPa per kelvin.Hence, for a tire filled to 32 psi, the approximation usually made is that within the range of normal atmospheric temperatures and pressures:Tire pressure increases 1 psi for each 10 Fahrenheit degree increase in temperature, or conversely decreases 1 psi for each 10 Fahrenheit degree decrease in temperature andin SI units, tire pressure increases 1.1 kPa for each 1 Celsius degree increase in temperature, or conversely decreases 1.1 kPa for each 1 Celsius degree decrease in temperature.From the table below, one can see that these are only approximations.".
- Q494390 thumbnail Prüfgeräte_Reifendruck.JPG?width=300.
- Q494390 wikiPageWikiLink Q103510.
- Q494390 wikiPageWikiLink Q1116609.
- Q494390 wikiPageWikiLink Q11579.
- Q494390 wikiPageWikiLink Q12457.
- Q494390 wikiPageWikiLink Q1276284.
- Q494390 wikiPageWikiLink Q1411232.
- Q494390 wikiPageWikiLink Q1415117.
- Q494390 wikiPageWikiLink Q1420.
- Q494390 wikiPageWikiLink Q169545.
- Q494390 wikiPageWikiLink Q191785.
- Q494390 wikiPageWikiLink Q1930094.
- Q494390 wikiPageWikiLink Q1946072.
- Q494390 wikiPageWikiLink Q2162595.
- Q494390 wikiPageWikiLink Q2377289.
- Q494390 wikiPageWikiLink Q2584294.
- Q494390 wikiPageWikiLink Q2872553.
- Q494390 wikiPageWikiLink Q39552.
- Q494390 wikiPageWikiLink Q44395.
- Q494390 wikiPageWikiLink Q5280298.
- Q494390 wikiPageWikiLink Q606876.
- Q494390 wikiPageWikiLink Q626299.
- Q494390 wikiPageWikiLink Q641227.
- Q494390 wikiPageWikiLink Q8280244.
- Q494390 wikiPageWikiLink Q8854154.
- Q494390 comment "Cold inflation pressure is the inflation pressure of tires before the car is driven and the tires warmed up. Recommended cold inflation pressure is displayed on the owner's manual and on the placard (or sticker) attached to the vehicle door edge, pillar, glovebox door or fuel filler flap.".
- Q494390 label "Cold inflation pressure".
- Q494390 depiction Prüfgeräte_Reifendruck.JPG.