Posted by Cuzzy on Thursday, January 4, 2007 at 3:43pm.
A basketball is inflated in a garage at 25 degrees C to a gauge pressure of 8.0 psi. Gauge pressure is the pressure above atmospheric pressure, which is 14.7 psi. The ball is used on the driveway at a temperature of 7 degrees C and feels flat. What is the actual pressure of the air in the ball? What is the gauge pressure?
I'm pretty sure I need to use P1V1/T1= P2T2/V2 for this problem, but how can you when both the pressure and volume are unknown? Also, I don't really get the idea of gauge pressure. To find my second answer, would I add 8.0 to the first answer?
The true pressure (absolute pressure) in the ball is gauage + atmospheric. Remember if the guage pressure was zero, there is still atmospheric pressure in the ball....it is NOT empty. Use true (absolute ) pressure in these problems.
Actual pressure P1 in the ball is 8 Plus atmospheric. You are solving for P2.
You can always use that formula. In this case you do not know P2.
Change all temps to Kelvins.

Chemistry  Anonymous, Thursday, December 9, 2010 at 10:08pm
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