流體

從壓力出發，連到靜水壓、連續方程、伯努利原理、浮力與終端速度。

Use this topic page when you want the fluids path to stay bounded and causal. The branch starts with a surface load, keeps pressure honest as a force-per-area quantity, then adds the static-fluid story where pressure acts equally in all directions at one point while still increasing with depth. From there the moving-fluid branch stays compact: Continuity Equation keeps one stream honest by conserving volume flow rate through narrow and wide sections, Bernoulli's Principle turns that same speed bookkeeping into a pressure-and-height trade, buoyancy reuses pressure difference to explain displaced-fluid weight and floating height, and Drag and Terminal Velocity closes the loop with one falling-body bench where a real fluid pushback grows with speed until the forces balance. That keeps the topic coherent without turning into a giant fluids survey.