Mechanical Definitions |
Pressure : It is an effect which occurs when a force
is applied on a surface of an object. Symbol of pressure is
p (lower case). |
Pressure Angle : The angle which is made by the line
of force with a line at right angles to the center line of two
gears at the pitch points. |
Pressure-containing Member : It is a part of a pressure-relieving
device and the device is in direct contact with the pressurized
medium in the vessel being protected. |
Pressure Plate : It is a part of an automobile disk clutch
which presses against the flywheel. |
Pressure-retaining Member : It is a part of a pressure-relieving
device which is loaded by the restrained pressurized fluid.
|
Primary Air : It is a portion of the combustion air which
is introduced with the fuel in a burner. |
Prime Mover : It is a component of a power plant which
is used to transform energy from the thermal or the pressure
form to the mechanical form. Such as a tractor or truck, usually
with four-wheel drive used for hauling tasks. |
Priming Pump : It is a device on motor vehicles and tanks
which injects a spray of fuel into the engine to facilitate
starting. |
Profiling Machine : It is a machine that is used for
milling irregular profiles. The contour of a model guides the
cutting tool. |
Progression : It is a sequence of numbers or quantities
in which there is always the same relation between each quantity
and the one succeeding it. It is also called a Series.
- Arithmetic Progression : It is a sequence in which each
number after the first is formed by adding a constant to
the preceding number. In other words, all the numbers in
sequence are connected by a common difference.
For example 1, 3, 5, 7, 9, . . .
- Geometric Progression : It is a sequence in which all
the consecutive numbers are connected by a common ratio.
For example 3, 6, 12, 24, 48, . . .
- Harmonic Progression : It is a sequence of the reciprocals
of consecutive numbers from an arithmetic progression.
For example 1, 1/3, 1/5, 1/7, 1/9, . . .
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