Answer: Option C. Gauge Pressure
Piezometer is used to measure Gauge pressure.
Piezometer is used to measure gauge pressure. It is the most simple form of a manometer used. One end of a piezometer is connected to the point where pressure needs to be measured and the other end is free to the atmosphere.
Piezometer cannot be used for measuring gas pressure as one end of the piezometer is free to the atmosphere.
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