Absolute humidity:The ratio of water vapor in a sample of air to the volume of the sample.
Absolute zero:The temperature of - 273.16 or 0 K at which molecular motion vanishes.
Absorptance:The ratio of the total absorbed radiation to the total incident radiation.
Acceleration:The rate of change of velocity with respect to time.
Acceleration due to gravity:The acceleration imparted to bodies by the attractive force of the earth or any other heavenly body.
Achromatic:capable of transmitting light without decomposing it into its constituent colors.
Acoustics:The science of the production, transmission and effects of sound.
Acoustic shielding:A sound barrier that prevents the transmission of acoustic energy.
Adiabatic:Any change in which there is no gain or loss of heat.
Afocal lens:A lens of zero convergent power, whose focal points are infinitely distant.
Albedo:The fraction of the total light incident on a reflecting surface, especially a celestial body, which is reflected back in all directions.
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, one ampere is the flow of one coulomb of charge per second.
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, both the tangents drawn at the point of contact.
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, 1 = 10-10 m.
Angular momentum:Also called moment of momentum, it is the cross product of position vector and momentum.
Angular velocity:The rate of change of angular displacement with time.
Annihilation:A process in which a particle and antiparticle combine and release their rest energies in other particles.
Antineutrino:The antiparticle of neutrino, it has zero mass and spin ½.
Archimedes principle:A body immersed in a fluid experiences an apparent loss in weight which is equal to the weight of the fluid displaced by the body.
Atomic mass unit:It is equal to one-twelfth the mass of C -12 isotope of carbon, 1 amu = 1.66x 10-27 Kg.
Atomic number:The number of protons in an atomic nucleus.
Avogadro number:The number of molecules in a gram molecular weight of a substance, it is equal to 6.02 x 1023.
Avogadro’s law:Under the same conditions of temperature and pressure, equal volumes of all gases contain equal number of molecules.
Posted on Saturday, 21 July
Tagged as: Physics science trivias lesson physics 101
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