Hydraulics
The oodest Physical Science that deals with both stationary and moving bodies under the influence of force.
Mechanics
The branch Of Mechanics that deals with bodies at rest.
Statics
The branch of mechanics that deals with bodies in motion.
Dynamics
The science that deals with the behavior of fluids at rest (fluid statics) or in motion (fluid dynamics), and the interaction of fluids with solids or other fluid at the boundaries.
Fluid Mechanics
It is also referred as fluud mechanics considering fluids at rest as a special case of motion with zero velocity.
Fluid Dynamics
It is the branch of science concerned with the transportation of liquids through pipes and channels, especially as a source of mechanical force or control.
Hydraulics
Composed of liquid and gas
Fluids
Molecules can rotate and translate freely
Liquid
Molecules are far apart from each other, and molecules ordering is non-existent.
Gas
Molecules are arranged in a pattern that is repeated throughout.
Solid
Density
p=m/v
Specific Gravity
Y=w/v
It is a pressure measured by pressure gage.
Gage pressure/ Pgage
also known as barometric pressure, is the pressure within the atmosphere of the earth. If not given (Patm=101.32 KPa or 760mm of HG)
Atmospheric Pressure
It is the true pressure. It is equal to Pgage+Patm.
Absolute pressure/Pabs
It is a negative gage pressure
Vacuum pressure/Pvaccum
Is the ratio of the density or specific weight to the fluid to the density or specific weight of water at a temperature of 4°C.
Specific Gravity
Is the measure of a fluids resistance to internal shear stresses.
Dynamic Viscosity
Is the ratio of its dynamic viscosity to its density
Kinematic Viscosity