What is a millimeter water (4°C) unit?

It is a pressure unit defined by the pressure exerted by a 1 mm column of pure water at 4°C under standard gravity, used for very small pressures.

When should I use poundal per square foot?

This unit is used in the foot–pound–second system, mainly in legacy engineering, classroom problems, and converting historical pressure data.

Can I use this tool for high-pressure conversions?

No, this converter is designed for small pressure measurements and may not be suitable for high-pressure values.

How to Convert from Millimeter Water (4°C) to Poundal per Square Foot

Convert pressure values from millimeter water (4°C) to poundal per square foot using this easy-to-use online converter, designed for low-pressure measurements and engineering applications.

Millimeter water (4°C)

Poundal/square foot

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

Millimeter water (4°C) to Poundal/square foot Conversion Table

Millimeter water (4°C)	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.

Millimeter water (4°C) to Poundal/square foot Conversion Table
Millimeter water (4°C)	Poundal/square foot

Explore More Pressure Units Converter

What Is This Tool?

This tool converts pressure readings from millimeter water (4°C), a metric unit for very small pressures based on hydrostatic pressure of water, into poundal per square foot, a pressure unit from the foot–pound–second system used in legacy engineering contexts.

How to Use This Tool?

Enter the pressure value in millimeter water (4°C)
Select millimeter water (4°C) as the source unit
Choose poundal per square foot as the target unit
Click the convert button to see the result instantly
Use the results for engineering calculations or data comparisons

Key Features

Provides accurate conversion of small hydrostatic pressure units
Supports conversion between metric and FPS (foot–pound–second) pressure units
Useful for HVAC, laboratory measurements, and historical data analysis
Simple input and output interface for quick results
Browser-based with no installation required

Examples

5 millimeters water (4°C) equals 32.9479 poundal per square foot
0.1 millimeters water (4°C) converts to 0.65896 poundal per square foot

Common Use Cases

Measuring very small pressures in HVAC static pressure and cleanroom differentials
Calibrating low-range pressure sensors in laboratory experiments
Specifying pressure drops in small plumbing or drainage systems
Converting legacy FPS system pressure values for engineering analysis
Interpreting historical pressure data in modern SI units

Tips & Best Practices

Always confirm that pressure values represent hydrostatic pressure at 4°C for accuracy
Use this conversion for small pressure ranges for best relevance
Cross-check results with original measurement units when possible
Be mindful of the unit conventions in the target engineering context
Note that poundal per square foot is rarely used in contemporary designs

Limitations

Conversion is based on standard gravity and pure water at 4°C; different conditions affect results
Poundal per square foot is a non-SI and uncommon unit in modern engineering
Using this conversion outside of low-pressure ranges may be inappropriate
Discrepancies may arise if fluid density or temperature differs from assumptions

Frequently Asked Questions

What is a millimeter water (4°C) unit?: It is a pressure unit defined by the pressure exerted by a 1 mm column of pure water at 4°C under standard gravity, used for very small pressures.
When should I use poundal per square foot?: This unit is used in the foot–pound–second system, mainly in legacy engineering, classroom problems, and converting historical pressure data.
Can I use this tool for high-pressure conversions?: No, this converter is designed for small pressure measurements and may not be suitable for high-pressure values.

Key Terminology

Millimeter Water (4°C): A unit of very small pressure defined by the pressure from a 1 mm column of pure water at 4°C under standard gravity.
Poundal per Square Foot: A pressure unit in the FPS system representing one poundal of force applied uniformly over one square foot.
Hydrostatic Pressure: Pressure exerted by a fluid at equilibrium due to the force of gravity.

Quick Knowledge Check

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

Pressure from a 1 mm water column at 4°C under standard gravity

The force applied by 1 poundal on one square foot

Pressure exerted by air at standard temperature

Which system uses poundal per square foot as a pressure unit?

Metric system

Foot–pound–second (FPS) system

International System of Units (SI)

In which context is converting millimeter water (4°C) to poundal per square foot most useful?

Historical engineering data and low-pressure measurements

High-pressure industrial hydraulic systems

General weather pressure forecasting

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