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Fluid
 Moves continuously when you apply a shear
 flow
 amorphous
 no structural strength

Continuum Assumption
All matter is continuous (made up of many common molecules) such that the molecular nature can be ignored

When the Continuum Assumption is valid.
Valid for all fluids where a sufficient number of molecules exist to obtain statistical values of fluid properties (pressure, temperature, etc)

Bulk Modulus of Elasticity
Tells how compressible a fluid is; the bigger the bulk modulus is, the less compressible it is.

Cavitation
Thermodynamic boiling; decrease pressure and formation of bubbles and then immediate implosion; generally caused by increase in velocity

Viscosity
Shear stress resistance to deformation; is a function of the rate of deformation

Newtonian Fluid
If the viscous stresses that arise from its flow, at every point, are proportional to the local strain rate — the rate of change of its deformation over time

NonNewtonian Fluid
Properties differ than those of a Newtonian Fluid (shear thinning, shear thickening)

No Slip Condition
A fluid in contact will a solid surface has the velocity of the surface at the point of contact.

Surface Tension
Intensity of molecular attraction (energy per area)

Fluid Statics
Fundamentals: Pressure at a point in a fluid at rest or in motion is independent of direction (as long as no shearing stresses are present)

Surface Forces
Pressure, Shear Stress, etc.

Body Forces
Gravity, magnetic, electrical fields

Buoyancy
Force due to an imbalance in pressure

Bernoulli Assumptions
 Steady
 Incompressible
 No heat
 Streamlines
 Inviscid
 No Work

Stagnation Pressure
Pressure if you force the velocity to 0 along a streamline

When you can assume inviscid
if you are far away from the boundary and not in contact with an object

