Aberration
|
Aberration is a defect in the
image which is not a true picture of the taken object.
|
Abrasion
|
A
Phenomenon of wearing off because of friction
|
Absolute scale
|
The zero
of this scale of temperature corresponds to absolute zero.
|
Absolute zero
|
Zero of
thermodynamic temperature (0 kelvin)
|
Absorption hygrometer
|
A device
that is used for measuring the humidity of air
|
Acceleration due to gravity(g)
|
It is the
uniform acceleration produced in a freely falling body due to the
gravitational pull of the earth.
|
Accumulator
|
A type of
voltaic cell or battery that can be recharged by passing a current through it
from an external d.c. supply.
|
Acceleration (a)
|
The rate
of change of speed or of velocity
|
Accelerator
|
A machine
used for producing high energy charged particles and studying nuclear
reactions.
|
Acceptor
|
Materials
that are used for doping semiconductors whose atoms accept electrons form
neighbouring atoms known as host
|
Achromatic colour
|
A colour
that has no colour
|
Acoustics
|
Refers to
the study of the production and properties of sounds
|
Actinometer
|
Referes to
any of various instruments for measuring the intensity of electromagnetic
radiation.
|
Active device
|
An
electronic component such as a transistor that is capable of amplification
|
Adapter
|
A device
that is used for connecting parts of different size and shape
|
Admittance
|
It is a
measure of the ability of a circuit to conduct an alternating current.
|
Adsorption
|
The
process of formation of a layer of molecules of one substance on the surface
of a solid
|
Aerial
|
The part
of a radio system that transmits energy into or receives from the atmosphere
or space
|
Aerosol
|
A
colloidal dispersion of a solid or liquid in a gas
|
Air brakes
|
A system
of brakes that is operated by compressed air
|
Air conditioner
|
A device
that is used for reducing temperature and humidity of air in an enclosed
space
|
Air
|
It is a
gaseous mixture that surrounds the earth.
|
Alcohol thermometer
|
A
liquid-in-glass thermometer that uses ethanol as its working substance.
|
Allotropy
|
The
existence of a solid substance in different physical forms.
|
Alloy
|
A mixture
of two or more metals or of a metal with small amounts of non-metals.
|
Alnico
|
Used to
make permanent magnets.
|
Alternating current (A.C.)
|
A current
which flows alternately in one direction, then in the opposite direction
around a circuit.
|
Alternating voltage
|
The
voltage whose magnitude and direction change with time and after a certain
time the voltage recur with the same magnitude and in the same direction is
called alterating voltage
|
Amalgam
|
An alloy
of mercury with one or more other metals
|
Ammeter
|
A meter
used to measure electric current.
|
Ampere
|
The ampere
is the practical unit of electric current.
|
Ampere-hour
|
It is a
unit of quantity of electricity
|
Amplifier
|
An
electronic device that is used to increase the strength of an input signal
applied to it.
|
Amplitude
|
The
maximum value of a varying quantity from its mean value
|
Analyser
|
A device
for determining the plane of polarization of plane-polarized radiation
|
Anelasticity
|
It is the
property of a solid wherein stress and strain are not uniquely related in preplastic
range.
|
Anemometer
|
It is a
device that is used to measure the speed of wind.
|
Aneroid Barometer
|
It is a type
of barometer
|
Angle of refraction
|
The angle
between a refracted ray and the normal to the surface at the point of
refraction
|
Angstrom
|
Unit of
length
|
Angular displacement
|
Refers to
the angular or rotational displacement
|
Angular frequency
|
It is equal
to the number of complete rotations made by an object per unit time
|
Angular velocity
|
It is the
rate of change of angular displacement
|
Anion
|
Negatively
charged ion
|
Annealing
|
The
process of heating a solid to a temperature below the melting point.
|
Annular space
|
The space
between two rings (inner and an outer)
|
Anode
|
The
electrode that is a positive potential with respect to the cathode.
|
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