Air in an automobile tire with a volume of 18 ft3 is at 90oF and 25 psia.

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Air in an automobile tire with a volume of 18 ft3 is at 90oF and 25 psia. Determine
(a) The amount of air to be added to bring the pressure up to 30 psig. Assume the atmospheric pressure to be 14.7 psia and the temperature and volume to remain constant.
(b) What-if Scenario: What would the answer in (a) be if the pressure went up to 40 psig?
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