Differential manometers are used to measure___________________?
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Answer: C. Pressure difference
Explanation
Differential manometers connect to two distinct points in a system to measure the pressure difference directly. The displacement of the manometer fluid balances the pressure drop existing between the dual connection taps. Isolating the pressure difference eliminates external atmospheric influences from the primary flow measurement reading. Manometers use liquid columns in transparent tubes to determine pressure changes through hydrostatic equilibrium principles. Differential pressure measurement is essential for determining frictional resistance and flow restriction pressure drops. Connecting both tube limbs to different pressure sources cancels out ambient barometric pressure effects automatically.
Process engineers use differential manometers alongside orifice plates and venturi meters to measure pipeline flow rates. HVAC technicians rely on them to check pressure drops across air filters and ventilation duct networks. Monitoring pressure differences across packed absorption towers ensures proper operating stability without flooding. Absolute pressure measurement requires referencing a complete vacuum rather than comparing two arbitrary system pressure points. Gauge pressure gauges measure the difference between system pressure and ambient atmospheric pressure using a single tap. Pressure gradient describes a spatial rate of change rather than the direct pressure difference between locations.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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