أكاديميا - كولنز - معاجم الجيب العلمية - الفيزياء - انكليزي - فرنسي - عربي الحرف ٤_ b

Academia - Collins - Pocket Scientific Dictionaries - Physics - English - French - Arabic - Letter 4_ B


breeder reactor
Surrégénérateur m

Generated reactor. See nuclear power.


breezes, (land and sea)
Brise f (de terre et de mer

Naseem (land and sea). Winds and breezes are
Convection currents in the air. We feel the land breeze and the sea breeze near the coast, because the land temperature rises and falls faster than the water temperature rises and falls.
See specific heat capacity.

Therefore, warm air rises above the warm land in hot (A) and is replaced by cold air coming from the sea. On a cold night day, the opposite happens when the sea is warmer than the land (B).


bridge rectifier
Redresser mà pont

Bridge rectifier. See rectifier.


Brownian motion
Mouvement m brownien

Brownian motion. Random movement of small dirt particles in a fluid medium, for example. Each particle is so small that collisions with particles of the fluid medium do not balance it. Brownian motion constitutes good evidence for the kinetic model of matter. The movement of particles, which can be seen, provides evidence of the movement of molecules, which cannot be seen.


buoyancy
flotaison f

Float. The effect of an upward momentum (upthrust) on a body in a fluid medium. See Archimedes' principle and flotation. We say that a body is buoyant if it is difficult to sink.