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Fluid Unit

This presentation includes the basic terms needed to study fluids in a Physics class.

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Fluid Unit

• Fluid• A fluid is a substance that has the ability to

flow and alter their shape.

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• Density• Density is defined as a substance’s mass per

unit of volume.• Equation ρ = mass/volume• Units kg/m3

• Units g/cm3

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• Pressure• Force divided by area• Equation P = F/A• Metric Units N/m2

• English Units lbs/in2

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• Pascal’s Principle• Pressure is evenly distributed though out a

fluid equally on the walls of the container.

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• Buoyant Force• The force that counteracts weight of an object

floating.• The force is upward and enough to make an

object float.• The force is downward if the object is

submerged in a fluid.

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• Archimedes’ Principle• The magnitude of a buoyant force is equal and

opposite direction to the weight of the fluid displaced by the object.

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• Absolute Pressure• The resulting pressure upon an object due to

the depth of the fluid.• There is more pressure the deeper an object is

placed in a fluid.• P = P0 + ρgh

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• Bernoulli's Principle• Pressure decreases when the velocity of a

fluid increases.

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