Pressure tells us how much force is applied over a certain area. The formula for pressure is:
P=F/A
Where:
P (Pressure, in Pascals, Pa) → How much force is applied per unit area.
F (Force, in Newtons, N) → The total force pushing down.
A (Area, in square meters, m²) → The surface over which the force is applied.
Example Calculation:
Let’s say you press a 100 N force on a 2 m² surface.
P=100/2=50 Pa
So, the pressure is 50 Pascals (Pa).
Key Things to Remember:
More force → More pressure.
More area → Less pressure. (That’s why wide tires sink less in the sand!)
Pressure is measured in Pascals (Pa), where 1 Pa = 1 N/m².
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1. Pressure = Force ÷ Area– More force = more pressure– Bigger area = less pressure
2. Pressure in fluids = ρ × g × h– Increases with depth, density, or gravity(ρ = density, g = gravity, h = depth)
3. Atmospheric Pressure at Sea Level= 101,325 Pa or 1 atm(Caused by air’s weight above us)
4. Hydraulic SystemsUse fluid pressure to move things.Small force on small piston = big force on big piston.
5. Gas Pressure: Ideal Gas Law
P=nRTVP = \frac{nRT}{V}P=VnRT
More gas, higher temperature, or smaller volume = higher pressure.
6. Uses in Engineering– Dams, airplanes, car brakes, pipelines, engines, submarines– Pressure keeps them safe and working right.