The method
Before using the result
- Use consistent fluid properties at the operating temperature. Results do not select equipment or establish code compliance.
Worked examples
These original training examples illustrate the method for Journeyman Plumber (JP). Use the matching “Load example” button above to explore a variation; example values are not equipment settings or prescribed criteria.
1. Worked example
Translate a pressure reading into an equivalent liquid column before combining it with elevation head. Use the density of the actual liquid rather than a memorised water-only rule.
- Convert from
- Pressure
- Pressure difference
- 100 kPa
- Fluid density
- 1,000 kg/m³
- h = p / (1000 × 9.80665).
- Head = 10.197162129779283 m; pressure = 100000 Pa.
- Head: 10.19716 m
- Pressure difference: 100,000 Pa
2. Comparison example
Compare a different supplied condition using the same method. For Plumber Conquer, the important check is that the input meaning, units and method assumptions still match the problem.
- Convert from
- Pressure
- Pressure difference
- 200 kPa
- Fluid density
- 1,000 kg/m³
- h = p / (1000 × 9.80665).
- Head = 20.394324259558566 m; pressure = 200000 Pa.
- Head: 20.39432 m
- Pressure difference: 200,000 Pa
Check your understanding
1. Which relationship is used?
p = ρgh; h = p/(ρg).
2. Which assumption should you check first?
Use consistent fluid properties at the operating temperature. Results do not select equipment or establish code compliance.
3. How should you verify a different unit system?
Convert every input to the displayed calculation units first. Equivalent physical inputs must give equivalent results; a unit label alone does not convert a number.
Continue with the matching exam topic
This tool connects to Journeyman Plumber (JP) free practice. Work through a question independently, then use the calculation steps to identify where your method differs. The tool stays free whether or not you choose paid preparation.