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seilerbird
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If you inflate an RV tire to 100 psi at sea level and then drive to 14,000 feet, discounting temperature, will the tire pressure be the same, lower or higher?
mgb_phys said:It depends if this is a real tire or a 'homework' tire
In theory the absolute pressure doesn't depend on the altitude. If you put 100psi inside a container, that is 115psi absolute pressure inside and 15psi outside. The 100psi is called gauge pressure because it is what you would read on a gauge.
however in a real tire at altitude the outside pressure will be slightly lower and so there will be 115psi inside and perhaps 10psi outside. Although th epressure inside the tire hasn't changed a pressure gauge would read 105 (115-10) psi.
But in a real tire this change in the pressure difference would cause the tire to expand slightly (it's made of rubber) and the pressure inside would drop to slightly more than 100psi over the outside pressure, ie 110psi absolute,.
seilerbird said:But wait, if the tire would expand wouldn't that be because the volume increases inside the tire causing the pressure inside the tire to decrease?
Pressure at sea level is the atmospheric pressure exerted by the weight of the air above a specific point on Earth's surface. It is typically measured in units of pounds per square inch (psi) or millibars (mb).
Pressure at 14,000 ft is the atmospheric pressure at an altitude of 14,000 feet above sea level. It is significantly lower than the pressure at sea level due to the decreased weight of the air above.
As altitude increases, the pressure decreases. This is because the higher you go, the less air is above you, exerting less weight and therefore less pressure.
Pressure at altitude is important to know for a variety of reasons, including aviation, weather forecasting, and health considerations. It affects the performance of airplanes, can indicate changes in weather patterns, and can impact the human body at high altitudes.
Pressure at altitude can be measured using instruments such as barometers or altimeters. These instruments use different methods, such as measuring air pressure or altitude, to determine the pressure at a specific altitude.