Atmospheric pressure at sea level is 14.70 lb/in2. You are getting gas in San Jose and decide to check your tires. You find that the tire gauge reads 12 lb/in2 for one of your tires. How is this possible?
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The gauge pressure of a tire is 34.5 psi. The atmospheric pressure gauge pressure outside the tire is 14.7 psi What is the actual air pressure inside the tire? If this tire goes flat, what is the gauge pressure? What is the actual air pressure inside the flat tire? If you take this same inflated tire that has a gauge pressure of 34.5 psi up the mountain to an altitude where the atmospheric pressure is 11.4 psi, what gauge pressure will you read? Explain.
Timothy J.
Tire gauges for air pressure, as well as most other gauges used in an industrial environment take into account the pressure due to the atmosphere of the Earth. That's why your car gauge reads 0 before you put it on your tire to check your pressure. This is called gauge pressure. The real pressure within a tire or other object containing pressurized stuff would be a combination of what the gauge reads as well at the atmospheric pressure. If a gauge on a tire reads 10.42 psi, what is the real pressure in the tire in pascals? The atmospheric pressure is 1.01x105 Pa.
Sri K.
The gauge pressure in an automobile tire reads 32 pounds per square inch (psi) in the winter at 32 °F. The gauge reads the difference between the tire pressure and the atmospheric pressure (14.7 psi). In other words, the tire pressure is the gauge reading plus 14.7 psi. If the same tire were used in the summer at 110 °F and no air had leaked from the tire, what would be the tire gauge reading in the summer? [HINT: Recall that °C = 5/9(°F - 32).]
David C.
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