SOLUTION: When air is pumped into a tire, the pressure required varies inversely as the volume of air. If the pressure is 30 lb/in2 when the volume is 140 in3, find the pressure when the vo

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Question 821960: When air is pumped into a tire, the pressure required varies inversely as the volume of air. If the pressure is 30 lb/in2 when the volume is 140 in3, find the pressure when the volume is 100 in3.
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
When air is pumped into a tire, the pressure required varies inversely as the volume of air. If the pressure is 30 lb/in2 when the volume is 140 in3, find the pressure when the volume is 100 in3.
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PV = nRT
PV = k (a constant)
30*140 = k = 4200
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P*100 = 4200
P = 42 psi
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Pumping air into a tire doesn't work like that, btw.
It's another instance of the author of the problem not knowing what he's talking about.