Why is the temperature 4°C important in these units?

The units are based on the hydrostatic pressure of water at 4°C, which is used as a reference density for accurate and consistent low-pressure measurements.

Can I use this conversion for high-pressure scenarios?

No, these units and the conversion are suitable only for low-pressure, hydrostatic conditions and not designed for high-pressure or dynamic flow uses.

Where are these units commonly applied?

They are used in HVAC systems, fluid instrumentation labs, pump performance evaluations, water-distribution systems, and groundwater studies.

How to Convert from Inch Water (4°C) [inAq] to Foot Water (4°C) [ftAq]

Learn how to convert pressure measurements from inch water (4°C) to foot water (4°C), two units used for low-pressure hydrostatic measurements in HVAC, fluid mechanics, and water distribution.

Inch water (4°C) [inAq]

Foot water (4°C) [ftAq]

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

Inch water (4°C) [inAq] to Foot water (4°C) [ftAq] Conversion Table

Inch water (4°C) [inAq]	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.

Inch water (4°C) [inAq] to Foot water (4°C) [ftAq] Conversion Table
Inch water (4°C) [inAq]	Foot water (4°C) [ftAq]

Explore More Pressure Units Converter

What Is This Tool?

This converter allows you to translate pressure values from inch water (4°C) to foot water (4°C), providing an easy way to work with low pressure and hydraulic head measurements commonly used in various technical applications.

How to Use This Tool?

Enter a pressure value in inch water (4°C)
Select inch water (4°C) as the input unit and foot water (4°C) as the output unit
Click to convert the entered value to foot water (4°C)
Review the converted result shown in foot water (4°C)
Use the result for interpreting hydraulic head or low-pressure measurements

Key Features

Converts pressure units between inch water (4°C) and foot water (4°C)
Employs a precise conversion factor based on hydrostatic pressure of water at 4°C
Supports applications in HVAC, fluid instrumentation, groundwater, and pump systems
Browser-based tool with simple input and output process
Works with pressure units relevant for low-pressure and hydrostatic conditions

Examples

Convert 12 inch water (4°C) to foot water (4°C): 12 × 0.0833334449 = 1 ftAq
Convert 36 inch water (4°C) to foot water (4°C): 36 × 0.0833334449 = 3 ftAq

Common Use Cases

Measuring static and differential pressures in HVAC ducting and ventilation
Monitoring pressure drops in filters, strainers, and clean-room environments
Testing low-pressure gas lines and burner manifolds
Specifying hydraulic head values for pumps and water-distribution systems
Evaluating groundwater depth–pressure relationships

Tips & Best Practices

Ensure measurements are taken at or near 4°C for accuracy
Use this conversion only for low-pressure, hydrostatic conditions
Verify instrument calibration when monitoring sensitive pressure readings
Apply conversion results carefully in pump head and fluid mechanics analyses
Be aware of environmental factors that may affect water density or gravity

Limitations

Assumes water temperature is exactly 4°C and standard gravity conditions
May introduce slight errors if conditions differ from the defined reference
Not suitable for converting high-pressure or dynamic flow measurements
Units apply specifically to hydrostatic pressure contexts
Conversion precision is limited by environmental variations

Frequently Asked Questions

Why is the temperature 4°C important in these units?: The units are based on the hydrostatic pressure of water at 4°C, which is used as a reference density for accurate and consistent low-pressure measurements.
Can I use this conversion for high-pressure scenarios?: No, these units and the conversion are suitable only for low-pressure, hydrostatic conditions and not designed for high-pressure or dynamic flow uses.
Where are these units commonly applied?: They are used in HVAC systems, fluid instrumentation labs, pump performance evaluations, water-distribution systems, and groundwater studies.

Key Terminology

Inch water (4°C) [inAq]: A pressure unit defined by the hydrostatic pressure of a 1-inch column of pure water at 4 °C under standard gravity, used for low-pressure measurements.
Foot water (4°C) [ftAq]: A pressure unit corresponding to the hydrostatic pressure from a 1-foot column of water at 4°C, commonly expressing hydraulic head and low pressures.
Hydrostatic Pressure: The pressure exerted by a fluid at rest due to the force of gravity on its column height.

Quick Knowledge Check

What does 1 inch water (4°C) represent?

Pressure from a 1-meter column of water at 20°C

Pressure from a 1-inch column of water at 4°C

Pressure from a 1-foot column of water at 4°C

Which unit is typically used to express hydraulic head?

Inch water (4°C)

Foot water (4°C)

Pascal

What is a key limitation of using this conversion?

It assumes non-standard gravity

It only applies accurately at exactly 4°C

It is intended for high-pressure applications

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