Unit 8 · 8.2 — Pressure

Everything to learn here

• Concept: Pressure is a scalar quantity representing the distribution of a perpendicular force component across a specific 2D geometric area.
• Concept: In a static ideal fluid, absolute pressure increases linearly with depth due to the accumulated weight of the fluid column and any external pressure applied at the surface (P0).
• Equation: $$P=F_{\frac{perp}{A}}$$
• Equation: $$P=P0+\rho gh$$
• Vocabulary: Absolute Pressure — The total calculated pressure, summing the atmospheric (reference) pressure and the fluid's gauge pressure.
• Vocabulary: Gauge Pressure — The pressure difference strictly relative to the local atmospheric pressure (rho g h).
• Skill: Mathematical Routines — Calculating the absolute pressure on a submerged surface by integrating known fluid density, depth, and atmospheric pressure baselines.
• Skill: Experimental Design — Analyze a U-tube manometer to determine the unknown density of an introduced fluid by setting pressures equal at a common horizontal depth.
• Concept: Fluid pressure is the perpendicular force exerted per unit area by a liquid or gas on its container or submerged objects.

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