Thermometer pressure physics problem

AI Thread Summary
To find the pressure of a constant volume gas thermometer at -99 °C, the formula Pf = Pi * (Tf/Ti) is used, where Ti is the initial temperature and Tf is the final temperature. The initial conditions are set with Ti at 320 K and Pi at 5830 Pa. The final temperature Tf is converted to 174 K, leading to a calculation of Pf. The user questions whether to express the final pressure in psi or atm after calculating it as 8.46 psi. The discussion emphasizes the importance of unit consistency in thermodynamic calculations.
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Homework Statement


A constant volume gas thermometer has a pressure of 5830 Pa at 47 °C. What would the pressure be for -99 °C (in Pa)?



Homework Equations



Pf = Pi * (Tf/Ti)

The Attempt at a Solution



Ti = 47 deg C = 320 deg K
Tf = -99 deg C = 174 deg K
Pi = 5830 pa = 0.05755 atm + 1 atm = 15.55 psi
15.55psi * (174/320) = 8.46 psi...Is this how you do it?
 
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or do i leave it in atm?
 
Does anyone know how to do this?
 
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