Calculating pressure change with temperature?

Thread starter ISX
Start date Apr 29, 2007
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Change Pressure Temperature

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To calculate pressure change with temperature, use the formula P1/T1 = P2/T2, where P is pressure and T is absolute temperature. For example, if tires are inflated to 80 psi at 80°F, convert the temperature to the Rankine scale by adding 460, resulting in 540 R. To find the pressure at 90°F, convert 90°F to Rankine, which is 550 R. By rearranging the formula, you can determine the new pressure in psi. This method allows for accurate pressure adjustments based on temperature changes in a constant volume scenario.

Apr 29, 2007

ISX

How do I determine pressure in psi, if I know the temperature. Like I aired my tires up to 80psi at 80F, how would I calculate what the pressure in my tires would be at 90F?

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Apr 29, 2007

russ_watters

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With a constant volume: P1/T1=P2/T2. T is absolute temperature, so 80F is actually 80+460=540 R (Rankine scale).

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