VALICALC · TECHNICAL REFERENCE

Water Pressure & Head Reference

Compare pressure in kPa, bar and psi with hydrostatic head at an editable liquid density. Keep pressure difference separate from pipe friction and elevations.

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Search within the verified subset. Numeric sizes match complete designations; a nearby size is a candidate, not an exact match.

SELECTED REFERENCE

1 kPa difference

Liquid head
101.972 mm
Pressure difference
1 kPa
Bar
0.01 bar
All fields & cell provenance
Entered liquid density
1,000 kg/m³

v1.3.0 · verified 2026-10-07 · values use the valid conditions shown above

1 kPa difference101.972 mmBack to answer ↑

Explore the verified data

9 matching rows · 9 in this subset

Water Pressure & Head Reference, metric display
Pressure difference scenarioLiquid headPressure differenceBarActions
1 kPa difference101.972 mm1 kPa0.01 bar
10 kPa difference1,019.716 mm10 kPa0.1 bar
25 kPa difference2,549.291 mm25 kPa0.25 bar
50 kPa difference5,098.581 mm50 kPa0.5 bar
100 kPa difference10,197.162 mm100 kPa1 bar
200 kPa difference20,394.324 mm200 kPa2 bar
300 kPa difference30,591.486 mm300 kPa3 bar
500 kPa difference50,985.811 mm500 kPa5 bar
1000 kPa difference101,971.621 mm1,000 kPa10 bar

1 kPa difference

Liquid head
101.972 mm
Pressure difference
1 kPa
Bar
0.01 bar
More dimensions
Entered liquid density
1,000 kg/m³

10 kPa difference

Liquid head
1,019.716 mm
Pressure difference
10 kPa
Bar
0.1 bar
More dimensions
Entered liquid density
1,000 kg/m³

25 kPa difference

Liquid head
2,549.291 mm
Pressure difference
25 kPa
Bar
0.25 bar
More dimensions
Entered liquid density
1,000 kg/m³

50 kPa difference

Liquid head
5,098.581 mm
Pressure difference
50 kPa
Bar
0.5 bar
More dimensions
Entered liquid density
1,000 kg/m³

100 kPa difference

Liquid head
10,197.162 mm
Pressure difference
100 kPa
Bar
1 bar
More dimensions
Entered liquid density
1,000 kg/m³

200 kPa difference

Liquid head
20,394.324 mm
Pressure difference
200 kPa
Bar
2 bar
More dimensions
Entered liquid density
1,000 kg/m³

300 kPa difference

Liquid head
30,591.486 mm
Pressure difference
300 kPa
Bar
3 bar
More dimensions
Entered liquid density
1,000 kg/m³

500 kPa difference

Liquid head
50,985.811 mm
Pressure difference
500 kPa
Bar
5 bar
More dimensions
Entered liquid density
1,000 kg/m³

1000 kPa difference

Liquid head
101,971.621 mm
Pressure difference
1,000 kPa
Bar
10 bar
More dimensions
Entered liquid density
1,000 kg/m³

How to use this data

h[m]=Δp[Pa]/(ρg). Store head in canonical mm; pressure in kPa. 1bar=100kPa; psi display uses exact customary-unit definitions.

    CHECK THE METHOD

    Worked example

    100 kPa at 1000 kg/m³ gives 10.19716 m liquid head. At lower density the same pressure requires more head.

    Common lookup questions

    What should I confirm before using this lookup?

    Hydrostatic pressure head is one term in TDH. It is not total pump duty, gauge datum, available NPSH or a pressure-rating check; confirm liquid density and boundary pressures.

    TRACEABLE DATA

    Sources, scope & verification

    Dataset v1.3.0
    Last verified:

    Nine authored pressure-difference scenarios using g = 9.80665 m/s², not a fixed universal metres-per-bar value for every fluid.

    Values are curated product facts or generated scenarios. Paid standards, complete catalogs and source diagrams are not reproduced. A verification date applies to this documented subset.

    SI and customary-unit conversions ↗

    Type A · NIST · SP 1038, 2006; exact definitions used where available

    Original equations, chosen scenarios and generated values; no copied tables or drawings.

    Full provenance & artifact record
    Source checked
    2026-10-07
    Use basis
    authored-formula
    Artifact SHA-256
    No retained source artifact hash; see the stated source and verification record.

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