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What units does a compound pressure gauge for the low side of the system measure pressure in?

A. Psia
B. Torrs and microns
C. Psig and inches of mercury
D. Psia and microns

Answer :

Final answer:

The compound gauge measures pressure in P(sig) (pounds per square inch gauge) and inches of mercury (inHg). The SI unit of pressure is the Pascal (Pa). Other common units of pressure include the atmosphere (atm), often used for atmospheric pressure, and the Torr, typically used for vacuum measurements.

Explanation:

A compound pressure gauge for the low side of the system, which is typically used in systems such as those involving refrigerants, measures pressure in P(sig ) (pounds per square inch gauge) and inches of mercury.

This indicates that the answer is option c. 'P(sig) ' is a measure of pressure relative to the surrounding atmosphere, while 'inches of mercury' is a common unit of pressure measurement in the field of vacuum physics, often represented as "inHg".

As context, the SI unit of pressure is the Pascal, often represented in kilopascals or bars for larger pressures. Other common units include the atmosphere (atm), often used in relation to weather or atmospheric pressure, and the Torr, often used in vacuum measurements and named after the Italian physicist Torricelli who invented the mercury barometer for pressure measurement.

It's important to note that different units of pressure are used in different contexts and applications, which is the reason why requirement of specific units like P (sig) and inches of mercury in your compound pressure gauge.

Learn more about atmospheric pressure here:

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