A practical application closely related to the above problem is the use of a compressed fluid in a small can to reinflate a flat tire. Let’s refer to this product as “Fix-a-flat.” Suppose we wanted to design a fix-a-flat system based on propane. Let the can be 500 cm3 and the tire be 40,000 cm3. Assume the tire remains isothermal and at low enough pressure for the ideal gas approximation to be applicable. The can contains 250 g of saturated liquid propane at 298 K and 10 bar. If the pressure in the can drops to 0.85 MPa, what is the pressure in the tire and the amount of propane remaining in the can? Assuming that 20 psig is enough to drive the car for a while, is the pressure in the tire sufficient? Could another tire be filled with the same can?
Patient D is a 44-year-old accountant. She has two young children, and is the family’s main bread-winner. She has been admitted to the Emergency Department (ED) with a cardiac rhythm problem. RN Z has drawn up two syringes, one containing normal saline to flush the patient’s IV line and the other potassium chloride (KCl) to add to a burette
April 30, 2015
8:28 pm
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