What is poundal per square foot used for?

It is a pressure unit used mainly in legacy FPS engineering calculations, classroom mechanics problems, and converting historical pressure data into modern units.

Why is inch water (4°C) commonly used in HVAC?

Inch water at 4°C measures small pressure differences with fine resolution, making it ideal for HVAC ducting, filter monitoring, and laboratory pressure testing.

Does temperature affect inch water pressure readings?

Yes, inch water pressure values are specifically defined at 4 °C under standard gravity, so changing temperature conditions can affect accuracy.

How to Convert from Poundal/square Foot to Inch Water (4°C) [inAq]

Learn how to convert pressure values from poundal per square foot, a legacy FPS unit, to inch water column at 4°C, a common low-pressure measurement unit for HVAC and laboratory use.

Poundal/square foot

Inch water (4°C) [inAq]

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

Poundal/square foot to Inch water (4°C) [inAq] Conversion Table

Poundal/square foot	Inch water (4°C) [inAq]

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 Inch water (4°C) [inAq] Conversion Table
Poundal/square foot	Inch water (4°C) [inAq]

Explore More Pressure Units Converter

What Is This Tool?

This converter transforms pressure values from poundal per square foot (pdl/ft²), a traditional unit in the foot–pound–second system, into inch water (4°C) [inAq], a unit measuring hydrostatic pressure commonly used in HVAC and laboratory applications. It provides an easy way to interpret historical and low-pressure data in a more precise modern unit.

How to Use This Tool?

Enter the pressure value in poundal per square foot you want to convert
Select poundal/square foot as the source unit and inch water (4°C) as the target unit
Click the convert button to see the equivalent pressure in inch water (4°C)
Review the results and use them for HVAC, laboratory, or educational purposes

Key Features

Converts pressure from poundal/square foot to inch water (4°C) in a single step
Supports low-pressure values common in HVAC and laboratory settings
Browser-based and easy to use without installation
Helps interpret and compare legacy FPS pressure readings with modern units
Applies a standard conversion factor based on physical definitions

Examples

Convert 10 poundal/square foot: 10 × 0.0059745945 = 0.059745945 inch water (4°C)
Convert 50 poundal/square foot: 50 × 0.0059745945 = 0.298729725 inch water (4°C)

Common Use Cases

Translating low-pressure data from legacy FPS engineering documents into inch water units
Measuring static and differential pressures in HVAC ductwork and ventilation systems
Performing pressure drop monitoring across filters and clean-room equipment
Testing low-pressure gas lines and burner manifolds in laboratories
Solving classroom problems involving pressure units in mechanics courses

Tips & Best Practices

Ensure the input pressure uses poundal/square foot correctly for accurate conversion
Be aware that inch water pressure applies specifically at 4 °C and standard gravity conditions
Use the tool for relative pressure comparisons rather than absolute precision under varying temperatures
Refer to both units' definitions when comparing legacy data with modern measurements

Limitations

Poundal per square foot is a legacy unit and may be unfamiliar to many users today
Inch water pressure values depend on temperature and gravity and are defined at 4 °C standard gravity only
Conversion accuracy may vary slightly due to rounding when handling very low pressure values

Frequently Asked Questions

What is poundal per square foot used for?: It is a pressure unit used mainly in legacy FPS engineering calculations, classroom mechanics problems, and converting historical pressure data into modern units.
Why is inch water (4°C) commonly used in HVAC?: Inch water at 4°C measures small pressure differences with fine resolution, making it ideal for HVAC ducting, filter monitoring, and laboratory pressure testing.
Does temperature affect inch water pressure readings?: Yes, inch water pressure values are specifically defined at 4 °C under standard gravity, so changing temperature conditions can affect accuracy.

Key Terminology

Poundal per square foot: A legacy FPS pressure unit representing one poundal of force distributed over one square foot of area, approximately equal to 1.48816 pascals.
Inch water (4°C) [inAq]: The pressure exerted by a 1-inch column of pure water at 4 °C under standard gravity, used for measuring low-pressure levels with high resolution.

Quick Knowledge Check

Which unit is used to express pressure in the foot–pound–second system?

Inch water (4°C)

Poundal per square foot

Pascal

What is a common application of inch water (4°C) pressure measurements?

HVAC ducting pressure measurement

Measuring large atmospheric pressures

Calculating vehicle speed

What should be considered about inch water pressure when converting units?

It depends on temperature and gravity

It is independent of temperature

It is not affected by gravity

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