🔋college physics i – introduction review

key term - Pressure

Definition

Pressure is the force exerted per unit area on a surface. It is measured in Pascals (Pa) in the SI unit system.

5 Must Know Facts For Your Next Test

  1. Pressure in a fluid at rest increases with depth due to the weight of the fluid above.
  2. Pascal's Principle states that a change in pressure applied to an enclosed fluid is transmitted undiminished throughout the fluid.
  3. The pressure at a given depth in a static fluid is given by $P = P_0 + \rho gh$, where $P_0$ is the surface pressure, $\rho$ is the fluid density, $g$ is gravity, and $h$ is depth.
  4. Absolute pressure includes atmospheric pressure, while gauge pressure measures pressure relative to atmospheric pressure.
  5. In hydraulic systems, Pascal’s Principle allows for force multiplication, enabling smaller forces to lift heavier loads.

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