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Pressure (P)
Pressure is the intensity of force due to molecular bombardment.
Force per unit area.
Units:-
Temperature (T)
In gases, molecules move randomly the amplitude of the
motion being about 76 x 10-9 m in normal conditions, to
tens of millimeters at very low pressure.
The energy of the molecules is sensed as temperature.
Units:-
Volume (V)
Volume is the measure of space that the fluid takes up.
Units:-
Specific volume (v)
The specific volume is the volume of unit mass of fluid
and is the reciprocal of density.
Units:-
Density (, ‘Rho’)
Density is the mass per unit volume of the fluid.
Units:-
Specific weight (, ‘Omega’)
This is the weight per unit volume for the fluid, and is
related to density by
[Equation missing here]
where g is the local acceleration due to gravity.
Units:-
Relative density (, Gamma)
This is defined, for a liquid, as the density of the liquid,
divided by the density of water at 4C. For a gas it is the
density of the gas, divided by the density of air under
standard sea level conditions (a temperature of 15C and
a pressure of 1.013 x 105N/m2).
Units:-
(Dynamic) Viscosity (, ‘Mu’)
Viscosity is a property of the fluid which is a measure of
its resistance to a force causing one layer of the fluid to
move over another i.e. shear. In this way, liquids such as
tar, treacle have a higher viscosity than water and petrol.
Units:-
Kinematic viscosity (, ‘Nu’)
Kinematic viscosity is the ratio of the viscosity to the
density this ratio is a fluid property used when comparing
the magnitude of viscous forces to inertia forces.
Units:-
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