An example of gauge pressure is tire pressure.
Gauge pressure is the pressure relative to the surrounding atmospheric pressure. This means it's the difference between the absolute pressure and the atmospheric pressure. Many common pressure measurements utilize gauge pressure because it reflects the pressure exerted above what we're already experiencing from the atmosphere.
Here's how tire pressure serves as a great example, according to the provided reference:
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Tire Pressure Measurement: When you check the pressure in your car tires, you're reading a gauge pressure. The gauge indicates how much higher the pressure inside the tire is compared to the air pressure outside the tire.
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Altitude Change: As the reference notes, if you drive up a mountain, the atmospheric pressure decreases. The gauge pressure in your tires will increase even if the absolute pressure inside the tire remains the same (assuming no leaks). This is because the difference between the tire's internal pressure and the now-lower atmospheric pressure is greater.
Therefore, tire pressure provides a practical, everyday illustration of gauge pressure.
