1. What is Gauge Pressure?

Gauge pressure is the pressure relative to atmospheric pressure. It represents the difference between absolute pressure and atmospheric pressure, and is commonly used in various engineering and scientific applications.

2. How Does the Calculator Work?

The calculator uses the gauge pressure formula:

Where:

• \( P_g \) — Gauge pressure (Pa)
• \( P_{abs} \) — Absolute pressure (Pa)
• \( P_{atm} \) — Atmospheric pressure (Pa)

Explanation: Gauge pressure measures pressure above or below atmospheric pressure. Positive values indicate pressure above atmospheric, while negative values indicate vacuum or pressure below atmospheric.

3. Importance of Gauge Pressure Calculation

Details: Accurate gauge pressure calculation is essential for pressure measurement in various systems, including hydraulic systems, pneumatic systems, industrial processes, and scientific experiments.

4. Using the Calculator

Tips: Enter absolute pressure and atmospheric pressure in Pascals (Pa). Both values must be non-negative. Standard atmospheric pressure is approximately 101,325 Pa at sea level.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between absolute pressure and gauge pressure?
A: Absolute pressure is measured relative to a perfect vacuum, while gauge pressure is measured relative to atmospheric pressure.

Q2: Can gauge pressure be negative?
A: Yes, negative gauge pressure indicates pressure below atmospheric pressure (vacuum).

Q3: What are common units for pressure measurement?
A: Common units include Pascals (Pa), bars, atmospheres (atm), pounds per square inch (psi), and millimeters of mercury (mmHg).

Q4: Why is atmospheric pressure important in gauge pressure calculation?
A: Atmospheric pressure serves as the reference point for gauge pressure measurements. Changes in atmospheric pressure affect gauge pressure readings.

Q5: How does altitude affect gauge pressure measurements?
A: Atmospheric pressure decreases with altitude, which means gauge pressure readings at higher altitudes will be different from sea level readings for the same absolute pressure.