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Answer :
A compound pressure gauge measures pressure in two different units to accommodate different reference points or applications. Let's break down the options:
A. psia and psig:
- psia (pounds per square inch absolute) measures pressure relative to a vacuum (absolute zero pressure).
- psig (pounds per square inch gauge) measures pressure relative to the atmospheric pressure around us.
B. psia and microns:
- Microns usually refer to measurements of pressure in vacuum technology and are not typically paired with psia in compound pressure gauges.
C. psig and inches of mercury:
- Inches of mercury is another common unit of pressure, used especially in meteorological measurements and vacuum systems. However, it is less common to see this pairing in standard compound gauges.
D. psia and mm of mercury:
- Millimeters of mercury (mmHg) is a unit of pressure, but pairing it with psia in a standard commercial compound gauge is unusual.
After analyzing each option, the most accurate and common combinations for a compound pressure gauge are psia (absolute pressure) and psig (gauge pressure) because they offer both absolute and differential pressure readings commonly required in various industrial applications.
Therefore, the correct choice is:
A. psia and psig
A. psia and psig:
- psia (pounds per square inch absolute) measures pressure relative to a vacuum (absolute zero pressure).
- psig (pounds per square inch gauge) measures pressure relative to the atmospheric pressure around us.
B. psia and microns:
- Microns usually refer to measurements of pressure in vacuum technology and are not typically paired with psia in compound pressure gauges.
C. psig and inches of mercury:
- Inches of mercury is another common unit of pressure, used especially in meteorological measurements and vacuum systems. However, it is less common to see this pairing in standard compound gauges.
D. psia and mm of mercury:
- Millimeters of mercury (mmHg) is a unit of pressure, but pairing it with psia in a standard commercial compound gauge is unusual.
After analyzing each option, the most accurate and common combinations for a compound pressure gauge are psia (absolute pressure) and psig (gauge pressure) because they offer both absolute and differential pressure readings commonly required in various industrial applications.
Therefore, the correct choice is:
A. psia and psig
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