A quantity with a magnitude and a direction.
Vector Space
The three dimensional area where vectors can be plotted.
Vector Steering
A method of steering rockets and spacecraft where one or more thrusters are gimbal mounted so that the direction of the thrust vector may be moved in relation to the centre of gravity of the vehicle to produce a turning movement.
Vee Engine
One with two banks of in-line cylinders mounted with an angular separation on a common crankcase.
Vee Joint
Tongue and groove boards with their top corners beveled so when the two boards come together a V is formed.
A clockwise shift in the wind direction in the Northern Hemisphere at a certain location. In the Southern Hemisphere, it is counterclockwise.
A means of transport, generally meaning an automobile.
Vehicle Acceleration
The rate at which a vehicle accelerates, normally declared as time taken between two speed points.
Vehicle Aerodynamic Drag
Resistance of a vehicle body to motion through the air.
Vehicle Dynamics
The dynamic behaviour of the vehicle.
Vehicle Emissions
Harmful pollutants to the health and the environment include particulates, hydrocarbons, carbon dioxide, carbon monoxide, ozone, lead, and various oxides of nitrogen.
Vehicle Exterior Noise
Noise produced by a land based vehicle that is radiated to the surrounding environment.
Vehicle Interior Noise
The noise inside a vehicle is made up of three main components: Engine Noise, Road Noise and Wind Noise.
Vehicle Mass Ratio
The ratio of the final mass of a vehicle mf, after all propellant has been used, to the initial mass m0: vehicle mass ratio = mf/m0.
Vehicle Noise
The noise produced by a land based vehicle that is radiated to the surrounding environment (exterior noise) or that is observed by the occupants of the vehicle (interior noise).
Vehicle Performance
This covers a number of aspects including: acceleration, braking performance, top speed, cornering acceleration,
Vehicle Suspension
The springs, shock absorbers and linkages that suspend a vehicle's frame, body, engine, and drivetrain above its wheels.
A blood vessel that carries blood towards the heart.
Veitch Diagram
A diagram consisting of joined squares, which is used to give a graphic representation of basic logic relations.
A continuous-wave reflection Doppler system used to measure the radial velocity of an object.
Velocity is a vector quantity that specifies the time rate of change of displacement with respect to a reference frame.
Velocity Head
The difference between dynamic pressure and static pressure.
Velocity Modulation
Modification of the velocity of an electron beam by the alternate acceleration and deceleration of electrons.
Velocity of Escape
This is the initial velocity that an object would have to have if projected from the surface of a body (e.g. Earth) to reach infinity before coming to rest.
Velocity of Light in Vacuo
c = 2.997924580x108 ms-1
Velocity Pressure
The difference between dynamic pressure and static pressure.
Velocity Servosystem
A servosystem which controls the speed of the load it is driving.
Velocity Time Profile
A plot of velocity versus time. The area under thge graph is the total distance travelled.
Velocity Transducer
An electrical/mechanical transducer whose output is directly proportional to the velocity of the measured unit.
Vena Contracta
Point where the flow becomes parallel.
A thin layer, sheet or facing.
Venetian Red
A permanent red pigment composed of ferric oxide and obtained by igniting ferrous sulphate.
V Engine
One with two banks of in-line cylinders mounted with an angular separation on a common crankcase.
Venn Diagram
A diagram where sets are represented as simple geometric figures, with overlapping and similarity of sets represented by intersections and unions of the figures.
An opening in a vessel or other enclosed space for the removal of gas or vapour.
The controlled exchange of air.
Pertaining to the belly, or the underside of a vehicle.
A chamber in the lower part of the heart.
A short constriction in a tube between two longer tapered portions that are usually of unequal length but terminate with the same diameter.
Venturi Giovanni
Italian physicist responsible for the venturi.
Venturi Scrubber
A scrubbing liquid is introduced into the gas stream, which then passes through a contracted area of the scrubber at a high velocity creating a high dispersion of fine droplets.
Venturi Tube Meter
A flow meter used to determine the rate of flow and employing a venturi tube as the primary element for creating differential pressure in flowing gases or liquids.
The second planet from the sun in our solar system
A mixture of acetates of copper used in making some green pigments.
Mercury Sulphide, used as a red pigment, also known as cinnabar.
Vernal Equinox
The point at which the ecliptic intersects the celestial equator. Days and nights are most nearly equal in duration.
An auxiliary scale, invented by Pierre Vernier, which enables the reading of the smallest divisions of a graduated scale.
Vernier Caliper
The vernier caliper provides the three basic functions of inner, outer and depth gauge.
Vernier Engine
A small rocket engine that is used for fine adjustment.
As a function of, as distance versus time.
The direction of gravity at the point of observation.
Vertical Angles
Two angles that share a common vertex and whose sides form 2 lines.
Vertical Axis
On a graph, the straight line axis that is plotted from bottom to top, the y axis.
Vertical Axis Wind Turbine
Two basic types are drag based and lift based.
Vertical Circle
A great circle of the celestial sphere, through the zenith and nadir, perpendicular to the horizon.
Vertical Deflection Plates
A pair of parallel electrodes in a CRT that moves the electron beam up and down.
Vertical Ionization Energy
The energy required to remove an electron from an atom, molecule, or ion in the gas phase without moving any nuclei.
Vertical Line
A line that goes straight up and down, and whose slope is defined as infinite or undefined.
Vertical Plane
An imaginary plane that is perpendicular to the horizontal plane.
Vertical Polarization
An electromagnetic emission is vertically polarized when its electric field (E vector) is perpendicular to the plane of the earth.
Vertically Polarized
Waves that are radiated with the E field component perpendicular to the surface of the Earth.
Very High Frequency
Radio frequencies that are between 30 to 300 MHz.
Very Large Scale Integration
An integrated crcuit with 100,000 to 1,000,000 components.
Very Low Frequency
Radio Frequencies from 3 kHz to 30 kHz.
An entrance to a house that is usually enclosed.
Vestigial Sideband
The transmitted portion of the sideband which has been largely suppressed by a transducer.