1. What is PSI?

PSI (pounds per square inch) is a unit of pressure that measures the force applied perpendicular to the surface of an object per unit area. It's commonly used in various engineering and scientific applications.

2. How Does the Calculator Work?

The calculator uses the PSI formula:

Where:

• \( Force \) — Applied force in pounds (lb)
• \( Area \) — Surface area in square inches (in²)

Explanation: The formula calculates the pressure exerted when a force is distributed over a specific area.

3. Importance of PSI Calculation

Details: PSI is crucial in engineering, physics, and many industrial applications. It helps determine material strength, fluid pressure, and system safety limits.

4. Using the Calculator

Tips: Enter force in pounds and area in square inches. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between PSI and PSIG?
A: PSI measures absolute pressure, while PSIG measures pressure relative to atmospheric pressure (gauge pressure).

Q2: What are common PSI ranges?
A: Car tires (30-35 PSI), scuba tanks (3000 PSI), hydraulic systems (1000-5000 PSI).

Q3: How does PSI relate to other pressure units?
A: 1 PSI ≈ 6894.76 Pascals, 1 PSI ≈ 0.068046 atmospheres, 1 PSI ≈ 0.070307 kg/cm².

Q4: Why is area important in PSI calculation?
A: The same force applied over a smaller area creates higher pressure (sharper knives cut better).

Q5: Can PSI be negative?
A: In absolute terms, no, but gauge pressure (PSIG) can be negative relative to atmospheric pressure (vacuum).