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Fluids generally move in two ways. Understanding this is key to aerodynamics (cars/planes) and plumbing.
Fluid mechanics is the study of how —a category that includes both liquids and gases —behave when they are still (statics) or moving (dynamics). While it is often considered one of the toughest subjects in engineering due to its complex math, the core concepts are actually visible in your kitchen, your car, and even your own body. 1. What Exactly is a "Fluid"?
He closed his eyes and took a breath. He decided, for the first time, to stop being a stone. He would be the river. He would allow the "shear stress" of the world to move him, to shape him, and to carry him. He wasn't breaking; he was finally, after forty years, deforming continuously.
But change viscosity. The classic example is oobleck (cornstarch + water). Punch it, and it acts like a solid. Stir it slowly, and it acts like a liquid. Ketchup is another example: it’s thick in the bottle, but when you shake it (apply shear stress), it thins out and flows. Weird, right?
: A powerful engineer working on a rushing waterfall. He revealed Fluid Dynamics
