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Questions and Answers
Which instrument is used to measure pressures lower than the ambient atmospheric pressure?
Which instrument is used to measure pressures lower than the ambient atmospheric pressure?
- Vacuum gauge (correct)
- Manometer
- Thermometer
- Barometer
What is the unit of measurement for pressure?
What is the unit of measurement for pressure?
- Joule
- Newton
- Pascal (correct)
- Watt
What is the zero point for a vacuum gauge when measuring pressures lower than atmospheric pressure?
What is the zero point for a vacuum gauge when measuring pressures lower than atmospheric pressure?
- Total vacuum (correct)
- 760 mmHg
- 1 bar
- Ambient atmospheric pressure
What is the widely used mechanical device for measuring and indicating pressure?
What is the widely used mechanical device for measuring and indicating pressure?
What type of reading is simply referred to as 'gauge pressure'?
What type of reading is simply referred to as 'gauge pressure'?
What is typically measured in units of force per unit of surface area?
What is typically measured in units of force per unit of surface area?
Which gauge is used to measure pressures lower than the ambient atmospheric pressure?
Which gauge is used to measure pressures lower than the ambient atmospheric pressure?
What is the zero point for a vacuum gauge when measuring pressures lower than atmospheric pressure?
What is the zero point for a vacuum gauge when measuring pressures lower than atmospheric pressure?
What form of reading is simply referred to as 'gauge pressure'?
What form of reading is simply referred to as 'gauge pressure'?
What is a vacuum gauge used to measure?
What is a vacuum gauge used to measure?
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Study Notes
Pressure Measurement Instruments
- A vacuum gauge specifically measures pressures lower than ambient atmospheric pressure.
- Gauge pressure is the reading of pressure relative to atmospheric pressure.
- A pressure gauge is a widely used mechanical device for measuring and indicating pressure.
Units and Measurements
- Pressure is commonly measured in units of force per unit of surface area, for example, pascals (Pa) or pounds per square inch (psi).
- The zero point for a vacuum gauge indicates a complete vacuum, which is lower than atmospheric pressure.
Application of Gauges
- Vacuum gauges are utilized to measure the level of vacuum, which refers to pressures significantly below atmospheric levels.
- Gauge pressure readings do not account for atmospheric pressure, displaying only the pressure differential.
Summary of Gauge Types
- Important to differentiate between vacuum gauges for measuring low pressures and standard pressure gauges for standard atmospheric measurements.
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