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L1-Fluids

# L1-Fluids - Fluids and Bernoullis Equation Prof John Conway...

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Fluids and Bernoulli’s Equation Prof. John Conway Physics 7B - Lecture 1

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imagine a cube, 1 meter on a side... 1 liter = 1000 cm 3 = 1000 ml 1 m 3 = 1000 liter 1 cm 3 = 1 ml 1 kg H 2 O 1000 kg H 2 O
Density we can think of density as the amount of something per unit volume mass density = kg/m 3 usually use Greek symbol rho = ρ (not p !) density of water ρ water = 1000 kg / m 3

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Pressure weight = force of gravity = mg (g = 9.8 m/s 2 ) pressure = force per unit area what is the pressure at the bottom of our cubic meter of water? weight of cube (1000 kg)(9.8 m/s 2 ) = 9800 N pressure on bottom 9800 N/m 2 = 9800 Pa
Pressure what if we just had a narrow column? Would the pressure at the bottom be the same?

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Fluid Pressure pressure is force per unit area in a fluid, pressure pushes in all directions pressure varies with depth in a gravitational field: need to hold up column of fluid above! force = weight = mg = ρ Adg pressure = force/area = ρ gd
Atmospheric Pressure atmospheric pressure at sea level: 1 atm = 101325 Pa also measured in bars (1 bar = 1 atm), 760 mmHg = 760 torr, ... In our discussions always remember that there is atmospheric pressure, and if a fluid is open to the atmosphere, that’s what the pressure in the fluid is at that point!

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