glossary - Glossary The ratio of water vapor in a sample of...

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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:
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This note was uploaded on 10/15/2011 for the course PHYSICS 0207239 taught by Professor Mamar during the Spring '09 term at Jordan University of Science & Tech.

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glossary - Glossary The ratio of water vapor in a sample of...

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