2053-07-25 - Measuring Blood Pressure Blood pressure is...

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1 Measuring Blood Pressure • Blood pressure is measured with a special type of manometer called a sphygmomano- meter • Pressure is measured in mm of mercury Systolic > diastolic Samuel Siegfried Karl von Basch The word comes from the Greek sphygmós (pulse), plus the scientific term manometer (pressure meter) Buoyant Force • The magnitude of the buoyant force always equals the weight of the displaced fluid • The buoyant force is the same for a totally submerged object of a given volume, regardless of its shape or density--i.e. its weight fluid fluid fluid BV g w ρ = = •Buoyant force is up-against gravity •Mass of object determines if net force is up or down •Since fluid density depends on depth, objects float at different heights Equation of Continuity •A 1 v 1 = A 2 v 2 • The product of the cross- sectional area of a pipe and the fluid speed is a constant – Speed is high where the pipe is narrow and speed is low where the pipe has a large diameter • Av is called the flow rate Streamlines
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