What does one poundal per square foot represent?

It is a pressure unit in the FPS system, defined by applying one poundal of force uniformly over one square foot of area.

Why is foot water (4°C) used as a pressure unit?

Because it reflects the hydrostatic pressure from a one-foot column of pure water at 4°C, making it useful for hydraulic head and fluid height measurements.

Can temperature changes affect this conversion?

Yes, since the foot water unit relies on water density at exactly 4°C, temperature variations can affect accuracy.

How to Convert from Poundal/square foot to Foot water (4°C) [ftAq]

Easily convert pressure values from poundal per square foot, a legacy FPS/Imperial unit, to foot water (4°C), a hydrostatic pressure unit based on water column height at 4°C.

Poundal/square foot

Foot water (4°C) [ftAq]

Please check your input. It must be a valid numeric value.

Poundal/square foot to Foot water (4°C) [ftAq] Conversion Table

Poundal/square foot	Foot water (4°C) [ftAq]

Custom Unit Conversion Table Generator – Instant Printable Conversion Tables

Start Value

Enter the starting number (positive decimal or integer ≥ 0). Example: 0.1, 1, 5.

End Value

Enter the ending number (positive decimal or integer > Start Value). Example: 10, 50, 100.

Interval

Enter the step size (positive decimal > 0 and < End Value – Start Value). Example: 1.0, 2.5.

Poundal/square foot to Foot water (4°C) [ftAq] Conversion Table
Poundal/square foot	Foot water (4°C) [ftAq]

Explore More Pressure Units Converter

What Is This Tool?

This converter allows users to transform pressure measurements from poundal per square foot, a unit from the foot–pound–second system, into foot water (4°C), which represents the pressure exerted by a one-foot column of water at four degrees Celsius.

How to Use This Tool?

Enter the pressure value in poundal per square foot.
Select the target unit as foot water (4°C).
Click convert to see the corresponding pressure in foot water units.

Key Features

Converts pressure values from poundal/square foot to foot water (4°C).
Supports analysis in hydraulic engineering and fluid mechanics.
Facilitates translation of legacy FPS pressure data into water column pressure units.
Provides clear example calculations for straightforward use.

Examples

10 poundal/square foot equals approximately 0.004978835 foot water (4°C).
100 poundal/square foot converts to about 0.04978835 foot water (4°C).

Common Use Cases

Interpreting low pressures in hydraulic and pump system design.
Converting manometer readings in HVAC and fluid instrumentation tasks.
Analyzing groundwater pressure and static head measurements.
Translating historical engineering pressure data into usable modern units.

Tips & Best Practices

Ensure water temperature is considered at 4°C for accurate use of foot water pressure values.
Be cautious with very low values to prevent rounding errors during conversion.
Use the tool for legacy data requiring conversion into pressure units linked to hydraulic heads.

Limitations

Accuracy depends on the water being at exactly 4°C as density varies with temperature.
Poundal/square foot is mainly an outdated unit; modern contexts favor SI units.
Small conversion factors may yield values that need careful numerical treatment.

Frequently Asked Questions

What does one poundal per square foot represent?: It is a pressure unit in the FPS system, defined by applying one poundal of force uniformly over one square foot of area.
Why is foot water (4°C) used as a pressure unit?: Because it reflects the hydrostatic pressure from a one-foot column of pure water at 4°C, making it useful for hydraulic head and fluid height measurements.
Can temperature changes affect this conversion?: Yes, since the foot water unit relies on water density at exactly 4°C, temperature variations can affect accuracy.

Key Terminology

Poundal/square foot: A pressure unit in the FPS system representing one poundal of force applied over one square foot.
Foot water (4°C): A pressure unit equating to the pressure exerted by a one-foot column of water at 4°C.
Hydrostatic Pressure: The pressure exerted by a fluid at rest due to the force of gravity.

Quick Knowledge Check

What system does the poundal/square foot unit belong to?

Metric System

Foot–Pound–Second (FPS) System

International System of Units (SI)

Foot water (4°C) pressure is based on what physical concept?

Air pressure at sea level

Hydrostatic pressure of water column

Force applied per square meter

Why should temperature be considered when using foot water units?

It affects water density

It changes area measurements

It alters the poundal force

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