Examine the reading of the manometer that you use to measure...

Name: Problem 52, Chapter 10: College Physics
Uploaded: 2020-06-11T10:15:08-08:00
Duration: 1 min 35 s
Channel: Surjit Tewari
Description: Examine the reading of the manometer that you use to measure the pressure inside car tires. What are the units? Does the manometer measure the absolute pressure of the air inside the tires or gauge pressure? How do you know?

Examine the reading of the manometer that you use to measure the pressure inside car tires. What are the units? Does the manometer measure the absolute pressure of the air inside the tires or gauge pressure? How do you know?

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Key Concepts

Pressure Units

The measured pressure values typically use units such as pounds per square inch (psi) or bar, which express the force exerted per unit area. Knowing the units provides context for the level of pressure and helps in making consistent comparisons across different scenarios or instruments.

Gauge Pressure versus Absolute Pressure

Gauge pressure measures the difference between the pressure inside the tire and the ambient atmospheric pressure, whereas absolute pressure includes the atmospheric component. In the context of tire pressure measurements, the manometer reads gauge pressure because it indicates how much the tire pressure exceeds the surrounding atmospheric pressure, which is what is relevant for tire performance.

Manometer Operation

A manometer works by comparing the pressure of a fluid to a reference pressure—often atmospheric pressure—using a column of liquid. The height difference in the liquid directly correlates to the pressure difference, which in the case of tire pressure is the gauge pressure. This operating principle confirms that the instrument is set up to measure the excess pressure over ambient conditions.

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