What is a foot water (4°C) unit?

It is a pressure unit representing the hydrostatic pressure exerted by a one-foot column of pure water at 4°C.

Why is millibar used for pressure measurements?

Millibar is widely used in meteorology and atmospheric sciences to express air pressure and calibrate weather instruments.

Can I use this converter for any temperature?

The foot water unit is based on water density at 4°C, so variations in temperature can impact conversion accuracy.

How to Convert from Foot water (4°C) [ftAq] to Millibar [mbar]?

Learn how to convert pressure measurements from foot water (4°C) to millibar using this easy-to-use online unit converter tool. Suitable for hydrology, HVAC, and meteorology applications.

Foot water (4°C) [ftAq]

Millibar [mbar]

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

Foot water (4°C) [ftAq] to Millibar [mbar] Conversion Table

Foot water (4°C) [ftAq]	Millibar [mbar]

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 Millibar [mbar] Conversion Table
Foot water (4°C) [ftAq]	Millibar [mbar]

Explore More Pressure Units Converter

What Is This Tool?

This tool is designed to convert pressure values measured in foot water (4°C), a unit based on the hydrostatic pressure of water at 4°C, into millibar units commonly used in atmospheric sciences and meteorology.

How to Use This Tool?

Enter the pressure value in foot water (4°C).
Select foot water (4°C) as the input unit and millibar as the output unit.
Click convert to see the equivalent pressure in millibar.

Key Features

Converts pressure from foot water (4°C) to millibar quickly and accurately.
Browser-based and user-friendly interface.
Supports applications in hydrology, HVAC, and weather instrumentation.

Examples

2 ftAq equals approximately 59.7796 mbar.
0.5 ftAq equals approximately 14.9449 mbar.

Common Use Cases

Specifying hydraulic head and low pressures in pumps and water distribution systems.
Interpreting manometer or gauge readings in laboratory and HVAC contexts.
Expressing static head or depth-pressure relationships in groundwater studies.
Converting hydrostatic pressures to atmospheric pressure units for meteorology and instrumentation.

Tips & Best Practices

Ensure water temperature is close to 4°C for accurate foot water unit pressure.
Use millibar conversions primarily for atmospheric or instrumentation pressure analysis.
Double-check unit selections when converting to maintain data consistency.

Limitations

Foot water measurements assume water density at 4°C; temperature changes or impurities may affect accuracy.
Millibar is optimal for atmospheric pressures but less common for purely hydraulic pressure contexts, requiring careful interpretation.

Frequently Asked Questions

What is a foot water (4°C) unit?: It is a pressure unit representing the hydrostatic pressure exerted by a one-foot column of pure water at 4°C.
Why is millibar used for pressure measurements?: Millibar is widely used in meteorology and atmospheric sciences to express air pressure and calibrate weather instruments.
Can I use this converter for any temperature?: The foot water unit is based on water density at 4°C, so variations in temperature can impact conversion accuracy.

Key Terminology

Foot water (4°C) [ftAq]: A pressure unit equal to the hydrostatic pressure exerted by a 1-foot column of pure water at 4°C.
Millibar [mbar]: A unit of pressure equal to one-thousandth of a bar, commonly used in meteorology to express atmospheric pressure.
Hydraulic Head: The height of a water column that produces pressure at its base, often expressed in feet of water.

Quick Knowledge Check

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

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

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

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

What is millibar commonly used to measure?

Hydraulic head in pumps

Atmospheric air pressure

Water depth in wells

Why might foot water conversions be less accurate?

Because water density varies with impurities and temperature changes

Because millibar is not precise

Because foot water is based on air pressure

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