1. What is Pressure in Physics?

Definition: Pressure is the force applied perpendicular to the surface of an object per unit area over which that force is distributed.

Purpose: Understanding pressure helps explain phenomena like why sharp knives cut better, how hydraulic systems work, and how atmospheric pressure affects weather.

2. The Pressure Formula

The calculator uses the formula:

Where:

• \( P \) — Pressure (Pascals, Pa)
• \( F \) — Force (Newtons, N)
• \( A \) — Area (square meters, m²)

Explanation: Pressure increases when force increases or when the area over which force is applied decreases.

3. Importance of Pressure Calculation

Details: Proper pressure calculations are essential in engineering designs, hydraulic systems, construction, and understanding natural phenomena.

4. Using the Calculator

Tips: Enter the force in Newtons and area in square meters. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the SI unit of pressure?
A: The SI unit of pressure is Pascal (Pa), which equals 1 Newton per square meter (N/m²).

Q2: How does area affect pressure?
A: For a given force, pressure increases as area decreases. This is why sharp knives cut better - the force is concentrated on a very small area.

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

Q4: How is pressure different from force?
A: Force is the total push or pull, while pressure is how concentrated that force is over an area. The same force can produce different pressures depending on the contact area.

Q5: What's atmospheric pressure at sea level?
A: Standard atmospheric pressure is about 101,325 Pa or 1 atm.