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, where positive values indicate pressure above atmospheric and negative values indicate vacuum or pressure below atmospheric.

3. Importance of Gauge Pressure Calculation

Details: Gauge pressure is essential in many industrial processes, pneumatic systems, hydraulic systems, and pressure measurement applications where relative pressure to atmospheric conditions is more relevant than absolute pressure.

4. Using the Calculator

Tips: Enter absolute pressure and atmospheric pressure in Pascals (Pa). Both values must be non-negative numbers. The result will be displayed in Pascals (Pa).

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between gauge pressure and absolute 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, which is often referred to as vacuum pressure.

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 (zero point) for gauge pressure measurements.

Q5: How does altitude affect gauge pressure measurements?
A: Since atmospheric pressure decreases with altitude, the same absolute pressure will yield different gauge pressure readings at different altitudes.