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Fluids Why do things feel lighter when they are under water? Buoyant Force Archimedes’ Principle Buoyant force = weight of fluid displaced Archimedes Example Gas bladder (swim bladder) in fish To attain neutral buoyancy Pressure in Fluids Constant movement of particles exerts pressure as they collide with a surface Pascal’s Principle Pressure applied to fluid in a closed container is equally transmitted to all parts of the fluid and the container. Think toothpaste… Applications of Pascal’s Principle… Hydraulic lifts – auto shop, barber chair, etc. Bernoulli’s Principle The pressure in a fluid decreases as the fluid’s velocity increases.