Absorptance:
The ratio of the total absorbed radiation to the total incident radiation.
 
Acceleration due to gravity:
The acceleration imparted to bodies by the attractive force of the earth or any other heavenly body.
 
Acceleration:
The rate of change of velocity with respect to time.
 
Achromatic:
Capable of transmitting light without decomposing it into its constituent colors.
 
Acoustic shielding:
A sound barrier that prevents the transmission of acoustic energy.
 
Acoustics:
"The science of the production
 
Adiabatic:
Any change in which there is no gain or loss of heat.
 
Afocal lens:
"A lens of zero convergent power
 
Albedo:
"The fraction of the total light incident on a reflecting surface
 
Alpha particle:
The nucleus of a helium atom (two protons and two neutrons) emitted as radiation from a decaying heavy nucleus.
 
Alternating current:
The electric current that changes its direction periodically.
 
Amorphous:
Solids which have neither definite form nor structure.
 
Ampere:
"S.I. Unit of electric current
 
Amplitude:
The maximum absolute value attained by the disturbance of a wave or by any quantity that varies periodically.
 
Angle of contact:
"The angle between tangents to the liquid surface and the solid surface inside the liquid
 
Angle of incidence:
The angle between the incident ray and the normal.
 
Angle of reflection:
The angle between the reflected ray and the normal.
 
Angle of refraction:
The angle between the refracted ray and the normal.
 
Angle of repose:
The angle of inclination of a plane with the horizontal such that a body placed on the plane is at the verge of sliding.
 
Angstrom:
"A unit of length
 
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