What does foot water (4°C) [ftAq] measure?

It measures pressure as the hydrostatic pressure exerted by a 1-foot column of pure water at 4°C, commonly used to express low pressures or hydraulic head.

Why convert foot water (4°C) to ton-force (long)/square inch?

Converting allows compatibility with legacy British imperial pressure units used in historical engineering documents and heavy machinery specifications.

Is ton-force (long)/square inch commonly used today?

No, it is a legacy unit primarily found in older technical documents and is less common in contemporary practice.

Convert Foot Water (4°C) [ftAq] to Ton-force (long)/square inch Pressure Units

Easily convert pressure units from foot water (4°C) [ftAq] to ton-force (long)/square inch with this online converter. Ideal for engineering and hydraulic applications.

Foot water (4°C) [ftAq]

Ton-force (long)/square inch

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Foot water (4°C) [ftAq] to Ton-force (long)/square inch Conversion Table

Foot water (4°C) [ftAq]	Ton-force (long)/square inch

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Foot water (4°C) [ftAq] to Ton-force (long)/square inch Conversion Table
Foot water (4°C) [ftAq]	Ton-force (long)/square inch

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What Is This Tool?

This tool converts pressure measurements from foot water (4°C) [ftAq], representing hydraulic head based on water density at 4°C, to ton-force (long)/square inch, a legacy British Imperial pressure unit used in heavy engineering.

How to Use This Tool?

Enter the pressure value in foot water (4°C) [ftAq]
Select ton-force (long)/square inch as the target unit
Click convert to view the equivalent pressure
Use the result for engineering calculations or legacy document interpretation

Key Features

Converts low pressures expressed as water column height into British Imperial pressure units
Uses a fixed conversion rate reflecting the weight of water at 4°C
Supports engineering, hydraulic, and legacy specification needs
Simple and accessible browser-based unit conversion

Examples

10 foot water (4°C) [ftAq] equals 0.001935334 ton-force (long)/square inch
100 foot water (4°C) [ftAq] equals 0.01935334 ton-force (long)/square inch

Common Use Cases

Specifying hydraulic head and low pressures in water systems and pumps
Interpreting gauge or manometer readings in HVAC and fluid instruments
Converting legacy British engineering pressures for machinery and ship fittings
Updating older industrial press specifications with modern units
Examining groundwater depth and pressure relationships

Tips & Best Practices

Ensure the water temperature corresponds to 4°C for accurate foot water pressure
Verify unit consistency when working across Imperial and SI measurement systems
Use this tool to assist conversion in legacy engineering documents carefully
Double-check converted values before applying in critical machinery contexts
Understand the context of each unit’s usage to avoid misinterpretation

Limitations

The foot water (4°C) unit is specific to water at exactly 4°C; variations affect accuracy
Ton-force (long)/square inch is a legacy unit, less common in modern measurements
Mixed unit usage requires careful analysis when integrating with SI unit-based data

Frequently Asked Questions

What does foot water (4°C) [ftAq] measure?: It measures pressure as the hydrostatic pressure exerted by a 1-foot column of pure water at 4°C, commonly used to express low pressures or hydraulic head.
Why convert foot water (4°C) to ton-force (long)/square inch?: Converting allows compatibility with legacy British imperial pressure units used in historical engineering documents and heavy machinery specifications.
Is ton-force (long)/square inch commonly used today?: No, it is a legacy unit primarily found in older technical documents and is less common in contemporary practice.

Key Terminology

Foot water (4°C) [ftAq]: A pressure unit based on the hydrostatic pressure of a 1-foot column of pure water at 4°C.
Ton-force (long)/square inch: A legacy British Imperial pressure unit equal to the weight of one long ton spread over one square inch.
Hydraulic Head: The height of a water column representing the pressure within a fluid system.

Quick Knowledge Check

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

Pressure from a 1-foot column of mercury

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

Pressure from atmospheric air at sea level

Which unit is considered legacy and used historically in British engineering?

Ton-force (long)/square inch

Foot water (4°C) [ftAq]

Pascal

Why is the foot water unit temperature specific?

Because different water temperatures affect water density and pressure

Because pressure units depend on atmospheric pressure

Because it measures air pressure, not water pressure

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