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

Foot water (4°C) represents pressure exerted by a 1-foot column of pure water at 4°C, which is a standard reference temperature for water density, making it useful in hydraulic contexts.

What is a poundal per square foot?

A poundal per square foot is a pressure unit in the foot–pound–second system, defined as one poundal of force evenly distributed over one square foot of area.

Can I convert these units for high-temperature water?

No, the conversion applies specifically at 4°C; for other temperatures, pressure equivalence changes due to water density variations.

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

Easily convert pressure values from foot water (4°C) to poundal per square foot using this straightforward unit converter, ideal for hydraulic, engineering, and fluid mechanics applications.

Foot water (4°C) [ftAq]

Poundal/square foot

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

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

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

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.

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

Explore More Pressure Units Converter

What Is This Tool?

This tool converts pressure measurements from foot water (4°C), a unit based on the hydrostatic pressure of a water column at 4 degrees Celsius, to poundal per square foot, a pressure unit in the FPS system. It bridges modern hydraulic data with traditional Imperial units.

How to Use This Tool?

Enter the pressure value in foot water (4°C) units
Select the destination unit as poundal per square foot
Click convert to see the equivalent pressure value in poundal/square foot
Use the result for engineering analysis or academic calculations

Key Features

Converts between foot water (4°C) and poundal/square foot pressure units
Supports applications in hydraulic engineering, fluid mechanics, and HVAC design
Provides easy translation from water column pressure values to FPS system units
Includes straightforward calculation based on defined conversion rate
Browser-based and user-friendly interface

Examples

Convert 2 ftAq: Multiply 2 by 2008.5018273125 to get 4017.003654625 poundal/square foot
Convert 0.5 ftAq: Multiply 0.5 by 2008.5018273125 to get 1004.25091365625 poundal/square foot

Common Use Cases

Defining hydraulic head and low pressures in water distribution systems and pumps
Interpreting manometer or gauge readings in fluid instrumentation and HVAC work
Relating groundwater depth and static pressure in well measurements
Converting legacy FPS/Imperial pressure data for engineering or academic purposes
Supporting classroom mechanics problems involving poundals and square feet

Tips & Best Practices

Ensure water temperature is near 4°C for accurate equivalence
Verify unit selection carefully to avoid conversion errors
Cross-check converted values in critical engineering applications
Use the tool as a bridge for integrating traditional and modern unit systems
Convert poundal/square foot values to SI units when necessary for modern standards

Limitations

Conversion is specific to water at 4°C; other temperatures alter pressure equivalence
Poundal per square foot is less common in contemporary use and may require further conversion
Environmental conditions affect the accuracy of pressure representation
Tool assumes correct interpretation of physical unit contexts

Frequently Asked Questions

Why is foot water (4°C) used as a pressure unit?: Foot water (4°C) represents pressure exerted by a 1-foot column of pure water at 4°C, which is a standard reference temperature for water density, making it useful in hydraulic contexts.
What is a poundal per square foot?: A poundal per square foot is a pressure unit in the foot–pound–second system, defined as one poundal of force evenly distributed over one square foot of area.
Can I convert these units for high-temperature water?: No, the conversion applies specifically at 4°C; for other temperatures, pressure equivalence changes due to water density variations.

Key Terminology

Foot water (4°C) [ftAq]: A pressure unit equal to the hydrostatic pressure of a 1-foot column of pure water at 4°C, used for hydraulic head and low-pressure measurements.
Poundal per square foot: A pressure unit in the FPS system defined as one poundal force applied over one square foot of area.
Hydraulic head: The height of a water column representing pressure exerted by water in a given context.

Quick Knowledge Check

What does one foot water (4°C) represent?

Pressure by a 1-foot air column at 4°C

Pressure by a 1-foot water column at 4°C

Force equal to one poundal

Which unit system includes poundal per square foot?

Metric System

Foot–Pound–Second (FPS) System

International System (SI)

What is a common use for converting foot water (4°C) to poundal/square foot?

Calculating high-temperature steam pressure

Relating water column pressure to FPS units for legacy engineering

Measuring electrical resistance

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