Saturday, 12 November 2016

dictionary of physics

school level dictionary of physics

Aberration is a defect in  the image which is not a true picture of the taken object.
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.
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
A machine used for producing high energy charged particles and studying nuclear reactions.
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
Refers to the study of the production and properties of sounds
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
A device that is used for connecting parts of different size and shape
It is a measure of the ability of a circuit to conduct an alternating current.
The process of formation of a layer of molecules of one substance on the surface of a solid
The part of a radio system that transmits energy into or receives from the atmosphere or space
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
It is a gaseous mixture that surrounds the earth.
Alcohol thermometer
A liquid-in-glass thermometer that uses ethanol as its working substance.
The existence of a solid substance in different physical forms.
A mixture of two or more metals or of a metal with small amounts of non-metals.
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
An alloy of mercury with one or more other metals
A meter used to measure electric current.
The ampere is the practical unit of electric current.
It is a unit of quantity of electricity
An electronic device that is used to increase the strength of an input signal applied to it.
The maximum value of a varying quantity from its mean value
A device for determining the plane of polarization of plane-polarized radiation
It is the property of a solid wherein stress and strain are not uniquely related in preplastic range.
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
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
Negatively charged ion
The process of heating a solid to a temperature below the melting point.
Annular space
The space between two rings (inner and an outer)
The electrode that is a positive potential with respect to the cathode.


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