Questions and Answers
What defines gauge pressure?
In what scenario does negative overpressure occur?
Which device is primarily used to measure eye pressure?
How is absolute pressure related to atmospheric pressure?
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Which of the following statements about a perfect vacuum is correct?
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What method is traditionally used to measure pressure in the body?
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Which of the following best describes gauge pressure readings?
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Which device can measure both positive and negative pressure?
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Study Notes
Pressure Measurement
- Pressure can be classified as negative or positive relative to atmospheric pressure.
Negative Pressure
- Defined as pressure lower than atmospheric pressure.
Gauge Pressure
- Also known as overpressure.
- Measured relative to ambient air pressure.
- Includes pressure from the weight of the atmosphere.
- Varies with height above sea level and weather conditions.
- Can be measured using a diaphragm sensor.
- Sufficient for most industrial applications.
Gauge Pressure vs. Absolute Pressure
- Absolute pressure measures pressure relative to a perfect vacuum (zero pressure).
- Only exists naturally in outer space.
- Calculated by adding gauge pressure to atmospheric pressure.
- Gauge pressure is absolute pressure minus atmospheric pressure.
Pressure Classification
- Positive overpressure: absolute pressure greater than atmospheric pressure.
- Negative overpressure: absolute pressure less than atmospheric pressure.
Devices used to Measure Pressure
- U-shape tube manometer: measures both positive and negative pressures.
- Tonometer: measures eye pressure (positive pressure only).
- Cystometer: measures urinary bladder pressure.
- Sphygmomanometer: measures blood pressure (positive pressure only).
Measurement in the Body
- Classical method: measuring the height of a liquid column that produces a pressure equal to the pressure being measured.
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Description
Learn about gauge pressure, atmospheric pressure, and how to measure pressure using diaphragm sensors. Understand the differences between positive and negative pressure.
