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elastic collision hamkubš-e kešâyand Fr.: collision élastique A collision between two particles which conserves the total kinetic energy and momentum of the system. |
elastic deformation vâdiseš-e kešâyand Fr.: déformation élastique A deformation of a → solid body in which the change (→ strain) in the relative position of points in the body disappears when the deforming stress is removed. See also → elastic limit. → elastic; → deformation. |
elastic limit hadd-e kešâyand Fr.: limite d'élasticité, ~ élastique The smallest → stress beyond which a → solid body can no longer return to its original shape. The material ceases to obey → Hooke's law. Also called → yield point. |
elastic scattering parâkaneš-e kešâyand Fr.: diffusion élastique In a → collision between two → particles,
the reaction in which the total → kinetic energy
of the system, projectile plus target, is the same before the collision as after. → elastic; → scattering. |
elastic wave mowj-e kešâyand (#) Fr.: onde élatique A wave that propagates by → elastic deformation of the medium. The → propagation takes place by a change in shape that disappears when the forces are removed. In other words, the displaced particles transfer momentum to adjoining particles, and are themselves restored to their original position. A → seismic wave is a type of elastic wave. |
elasticity kešâyandi (#) Fr.: élasticité The ability of a body which has been → deformed by an applied → force to return to its original shape when the force is removed. Up to a certain point the material obeys → Hooke's law. See also → ductility, → plasticity. |
electric barqi (#) Fr.: électrique Pertaining to, derived from, produced by, or associated with electricity. Term coined in by the English physicist William Gilbert (1540-1603) in treatise De Magnete (1600), from L. electrum "amber," from Gk. elektron "amber." Barqi, adj. of barq, → electricity. |
electric arc kamân-e barqi Fr.: arc électrique A luminous and extremely hot electrical → discharge between two → electrodes when an ionized → plasma is created in the air or gas across the electrodes. |
electric charge bâr-e barqi (#) Fr.: charge électrique The intrinsic property of matter responsible for all electric phenomena, occurring in two forms arbitrarily designated → negative and → positive. |
electric circuit barqrâh (#) Fr.: circuit électrique Physics: A closed path followed by an → electric current; a number of → conductors interconnected for the purpose of carrying an electric current. |
electric current jarayân-e barq (#) Fr.: courant électrique The → rate at which → electric charge → flows past a given point through a → conductor, measured in → amperes. |
electric dipole doqotbe-ye barqi Fr.: dipole électrique 1) Two equal and opposite charges separated by a very small distance. |
electric discharge vâbâr-e barqi Fr.: décharge électrique The flow of electricity through a gas, resulting in the emission of radiation that is characteristic of the gas and of the intensity of the current. |
electric field meydân-e barqi (#) Fr.: champ électrique The effect produced by the existence of an → electric charge in the volume of space that surrounds it. The direction of the field is taken to be the direction of the force it would exert on a positive test charge. The electric field is radially outward from a positive charge and radially in toward a negative point charge. |
electric intensity dartanuyi-e barqi (#) Fr.: intensité électrique The strength of an electric field at any point as measured by the force exerted upon a unit positive charge placed at that point. |
electric potential tavand-e barqi Fr.: potentiel électrique The amount of → work required to move a unit → electric charge from → infinity to a specific point against an → electric field. The → SI unit of electric potential is → joules per → coulomb, otherwise known as → volt. |
electric scalar potential tavand-e marpeli-ye barqi Fr.: potentiel électrique scalaire A potential φ defined so that the → electric field E is expressed by a combination of its → gradient and the variation of the → magnetic vector potential over time: E = -∇φ -∂A/∂t. |
electrical barqi (#) Fr.: électrique Of, relating to, or concerned with electricity; electric. |
electrical conductivity hâznadegi-e barqi Fr.: conductivité électrique A measure of a material's ability to conduct an electrical current. It is the reciprocal of the → resistivity. Conductivity is expressed by σ = ne^{2}l/(2mv), where n is the number of electrons per cm^{3} volume of the → conductor, e is the → electron charge, l is the → mean free path, m is the → electron mass, and v is the arithmetic mean velocity of thermal motion of electrons at a given temperature. → electrical; → conductivity. |
electrical network turbast-e barqi Fr.: réseau électrique An arrangement of the various electrical energy sources with interconnected electrical devices. |
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