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Manometer Pressure Difference Calculator — result sheet
Calculate gauge and absolute pressure from a manometer liquid density, column-height difference, gravity, and atmospheric pressure.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Gauge pressure magnitude = rho g h; connected-side absolute pressure = ambient pressure ± rho g h.
A manometer converts a liquid column height into a pressure difference. The side direction is explicit because a taller column can represent either a pressure above or below ambient depending on the tube arrangement.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Manometer-fluid density — kg/m³; minimum 1.0E-6; maximum 1000000
- Liquid-level difference — m; minimum 0; maximum 1000000
- Gravitational acceleration — m/s²; minimum 1.0E-6; maximum 1000
- Ambient absolute pressure — kPa; minimum 1.0E-6; maximum 1000000000
- Connected-side pressure — 2 choices
Worked example
| Input | Value |
|---|---|
| Manometer-fluid density | 13546 |
| Liquid-level difference | 0.076 |
| Gravitational acceleration | 9.80665 |
| Ambient absolute pressure | 101.325 |
| Connected-side pressure | higher |
Gauge pressure ≈ 10.10 kPa; connected-side absolute pressure ≈ 111.42 kPa.
Assumptions and limits
- Density is constant, the column difference is vertical, and all pressure inputs are absolute and use compatible units.
- The liquid is static and the pressure tap and reference surface are at the same elevation apart from the measured column.
- Capillarity, meniscus reading, gas density, vapor pressure, temperature expansion, and connected-line losses are not modeled.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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