What is the formula for pressure?

What is the formula for pressure?

• A. P = Force/Area
• B. P = Area/Force
• C. P = Force × Area
• D. P = Force - Area

Answer: (A)

Pressure tells us how concentrated a force is on a surface. It is defined as the force applied divided by the area over which it is spread: P = F / A. This means the same force over a larger area produces less pressure, while the same force over a smaller area produces more pressure. The units work out as newtons per square meter (N/m^2), known as the pascal. Why the other forms don’t fit: multiplying force by area would give a quantity with units like N·m^2 and isn’t a measure of concentration on a surface; subtracting area from force also isn’t meaningful for pressure in this context; and reversing the ratio (area divided by force) would imply pressure increases with area, which contradicts the idea of distributing the same force over a larger surface.

Pressure tells us how concentrated a force is on a surface. It is defined as the force applied divided by the area over which it is spread: P = F / A. This means the same force over a larger area produces less pressure, while the same force over a smaller area produces more pressure. The units work out as newtons per square meter (N/m^2), known as the pascal.

Why the other forms don’t fit: multiplying force by area would give a quantity with units like N·m^2 and isn’t a measure of concentration on a surface; subtracting area from force also isn’t meaningful for pressure in this context; and reversing the ratio (area divided by force) would imply pressure increases with area, which contradicts the idea of distributing the same force over a larger surface.