What does 1 millimeter mercury (0°C) represent?

It is the pressure exerted by a 1 mm column of mercury at 0 °C under standard gravity, roughly equal to 133.322 pascals.

Where is millimeter water (4°C) commonly used?

It is used for measuring very low pressures such as in HVAC static pressure, cleanroom differentials, and low-pressure sensor calibration.

Why is it important to consider temperature and gravity in conversions?

Because pressure values depend on these conditions; deviations can lead to inaccurate measurements.

How to Convert from Millimeter mercury (0°C) to Millimeter water (4°C)?

Learn how to convert pressure units from millimeter mercury (0°C) to millimeter water (4°C) with clear examples and understand common uses and limitations of these units.

Millimeter mercury (0°C)

Millimeter water (4°C)

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

Millimeter mercury (0°C) to Millimeter water (4°C) Conversion Table

Millimeter mercury (0°C)	Millimeter water (4°C)

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 mercury (0°C) to Millimeter water (4°C) Conversion Table
Millimeter mercury (0°C)	Millimeter water (4°C)

Explore More Pressure Units Converter

What Is This Tool?

This pressure unit converter transforms values from millimeter mercury at 0°C (mmHg) to millimeter water at 4°C (mmH2O), allowing users to switch between moderate and very low pressure measurements commonly used in medical, scientific, and engineering fields.

How to Use This Tool?

Enter the pressure value in millimeter mercury (0°C).
Select the target unit as millimeter water (4°C).
Click convert to get the equivalent pressure in millimeter water.

Key Features

Converts pressure units from mmHg (0°C) to mmH2O (4°C) using a precise conversion rate.
Supports applications from clinical blood pressure to low-pressure HVAC systems.
Browser-based and easy to use without installation.

Examples

2 mmHg equals approximately 27.19 mmH2O (2 × 13.5954348088).
0.5 mmHg equals approximately 6.80 mmH2O (0.5 × 13.5954348088).

Common Use Cases

Measuring clinical blood pressure for health monitoring.
Conducting laboratory experiments involving vapor or partial pressures.
Monitoring low-pressure differentials in HVAC and cleanroom environments.
Evaluating vacuum and barometric pressures in engineering applications.
Designing plumbing and filtration systems with small pressure drops.

Tips & Best Practices

Ensure measurements are taken at standard gravity and specified temperatures for accuracy.
Use mmH2O units for very low pressure readings such as HVAC or sensor calibration.
Verify unit compatibility when comparing or reporting pressure data across different fields.

Limitations

Conversion is based on standard gravity (9.80665 m/s²) and precise temperatures (0°C for mercury, 4°C for water).
Temperature or gravity deviations may cause inaccuracies.
Millimeter water units are not suitable for representing higher or fluctuating pressures commonly measured in mmHg.

Frequently Asked Questions

What does 1 millimeter mercury (0°C) represent?: It is the pressure exerted by a 1 mm column of mercury at 0 °C under standard gravity, roughly equal to 133.322 pascals.
Where is millimeter water (4°C) commonly used?: It is used for measuring very low pressures such as in HVAC static pressure, cleanroom differentials, and low-pressure sensor calibration.
Why is it important to consider temperature and gravity in conversions?: Because pressure values depend on these conditions; deviations can lead to inaccurate measurements.

Key Terminology

Millimeter mercury (0°C): A pressure unit defined by the pressure from a 1 mm column of mercury at 0°C under standard gravity.
Millimeter water (4°C): A pressure unit defined by the pressure exerted by a 1 mm column of pure water at 4°C under standard gravity.
Standard gravity: The acceleration due to gravity, standardized at 9.80665 m/s², used for pressure calculations.

Quick Knowledge Check

What unit does millimeter mercury (0°C) measure?

Temperature

Pressure

Length

What is the approximate conversion factor from mmHg (0°C) to mmH2O (4°C)?

0.07355

13.595

1000

Which unit is suitable for measuring very small pressures?

Millimeter mercury (0°C)

Millimeter water (4°C)

Atmospheres

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