Fluids, Gauge Pressure, & Archimedes Principle

Ideal Fluid

Incompressible fluids with no viscosity

Density

The mass per volume of an object

Density Equation

p = m/v

Pressure

The amount of force applied over an area

Pressure Equation

P = F/A

Fluid Pressure

Pressure due to the weight of a fluid on a surface

Fluid Pressure Equation

P = pgh

Gauge Pressure

Pressure relative to atmospheric pressure

Atmospheric Pressure

Pressure caused by the atmosphere

Absolute Pressure

The sum of gauge pressure and atmospheric pressure

Can absolute pressure ever be negative?

No, because fluids push instead of pull.

Buoyant Force

A new upward force on any object in a fluid

When the buoyant force > object weight

The object floats

When buoyant force < object weight

The object sinks

When buoyant force = object weight

The object stays in place

Archimedes Principle

The buoyant force on an object equals the weight of the fluid it displaces

Apparent Weight

The weight of an object minus the buoyant force