1. What is PSI?

Definition: PSI (pounds per square inch) is a unit of pressure measuring the force applied over one square inch of area.

Purpose: It's commonly used to measure tire pressure, hydraulic systems, and other pressure-related applications.

2. How is PSI Calculated?

The calculator uses the formula:

Where:

• \( P \) — Pressure (psi)
• \( F \) — Force (pounds, lb)
• \( A \) — Area (square inches, in²)

Explanation: Pressure is calculated by dividing the force applied by the area over which it's distributed.

3. Importance of PSI Calculation

Details: Proper pressure calculation ensures safety in pressurized systems, optimal performance in mechanical systems, and correct specifications for engineering projects.

4. Using the Calculator

Tips: Enter the force in pounds and area in square inches. Both values must be greater than zero.

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: How do I convert PSI to other pressure units?
A: 1 PSI = 6.89476 kPa, 1 PSI = 0.0689476 bar, 1 PSI = 0.070307 kgf/cm²

Q3: What's a typical car tire PSI?
A: Most passenger cars require 30-35 PSI, but always check your vehicle's specifications.

Q4: How does area affect pressure?
A: For the same force, smaller contact areas result in higher pressure.

Q5: What's the PSI at sea level?
A: Standard atmospheric pressure is about 14.7 PSI at sea level.