MCAT Basics (from MedSchoolCoach) Fluid Statics
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Jun 27, 2024 Dive into the fascinating world of fluid statics, where you'll explore intriguing properties like surface tension and the differences between adsorption and absorption. Discover how Pascal's Law governs pressure in fluids and learn the nuances of gauge versus absolute pressure. Gain insight into osmotic pressure and its effects on cells, along with Archimedes' principle that explains buoyancy. Each topic is unpacked with clarity, making complex concepts accessible and relevant for aspiring medical students.
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Definition of Fluid by Shear Force
- A fluid is defined as a material that deforms when a shear force is applied, meaning it can flow or change shape.
- This distinguishes fluids (liquids and gases) from solids, which resist deformation under shear force.
Surface Tension and Cohesion
- Surface tension measures the force required to break a liquid's surface and reflects cohesive forces within the liquid.
- Higher surface tension means stronger intermolecular attractions, as seen in water (72 mN/m) versus hexane (18 mN/m).
Adsorption vs Absorption Explained
- Adsorption is fluid molecules sticking to a surface while absorption is fluid taken up into another phase.
- Adsorb is not a real term; the distinction between adsorption and absorption is important for MCAT.