# Thread: hw for phys thank you

1. ## hw for phys thank you

The UL Lafayette particle accelerator uses sulfur hexafluoride (SF6) as an insulating gas for its high voltage terminal. One day, this tank was filled with gas at a temperature of 82 °F to a pressure of 75 lb/in2 (psi). The night after the fill was completed, a cold front comes through Lafayette and lowers the temperature. The pressure in the tank reads 72 psi on the colder day after the fill. What is the new temperature in °F? Remember to convert ° F to K and back again for these calculations. 65 °F
60 °F
81 °F
56 °F
74 °F

2. Originally Posted by johnjohn
The UL Lafayette particle accelerator uses sulfur hexafluoride (SF6) as an insulating gas for its high voltage terminal. One day, this tank was filled with gas at a temperature of 82 °F to a pressure of 75 lb/in2 (psi). The night after the fill was completed, a cold front comes through Lafayette and lowers the temperature. The pressure in the tank reads 72 psi on the colder day after the fill. What is the new temperature in °F? Remember to convert ° F to K and back again for these calculations. 65 °F
60 °F
81 °F
56 °F
74 °F

Sounds like a Boyle's Law problem:
$\displaystyle \frac{P_1}{T_1} = \frac{P_2}{T_2}$

where the temperature scale is in absolute. I would use the temperature in Kelvin (rather than the antiquated Rankine scale.)

-Dan