1. What is an inH2O to inHg Calculator?

Definition: This calculator converts pressure measurements from inches of water column (inH2O) to inches of mercury (inHg).

Purpose: It helps engineers, meteorologists, and HVAC professionals convert between these common pressure units used in various applications.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{inHg} \) — Pressure in inches of mercury
• \( P_{inH2O} \) — Pressure in inches of water
• 13.5951 — Conversion factor (density ratio of mercury to water)

Explanation: The conversion factor represents the ratio of mercury's density to water's density at standard conditions.

3. Importance of Pressure Unit Conversion

Details: Accurate pressure conversion is crucial for applications like barometric pressure measurements, HVAC system design, and industrial process control.

4. Using the Calculator

Tips: Simply enter the pressure value in inches of water (inH2O) and the calculator will provide the equivalent in inches of mercury (inHg).

5. Frequently Asked Questions (FAQ)

Q1: Why is the conversion factor 13.5951?
A: This represents the density ratio of mercury (13,595.1 kg/m³) to water (1,000 kg/m³) at standard temperature and pressure.

Q2: What are typical applications for inH2O measurements?
A: Commonly used for measuring low pressures in HVAC systems, gas pressures, and differential pressures.

Q3: Where is inHg typically used?
A: Inches of mercury is often used in meteorology for barometric pressure and in some industrial vacuum measurements.

Q4: How precise is this conversion?
A: The conversion is precise for standard conditions (0°C, 1 atm). For high precision applications, temperature corrections may be needed.

Q5: Can I convert inHg back to inH2O?
A: Yes, simply multiply inHg by 13.5951 to get inH2O.