أكاديميا - كولنز - معاجم الجيب العلمية - الفيزياء - انكليزي - فرنسي - عربي الحرف ٧_ s

Academia - Collins - Pocket Scientific Dictionaries - Physics - English - French - Arabic Letter 7_ S


static electricity
electrostatic f

Static electricity. Study of charges and how they affect others. Stasis often appears when rubbing an insulator, as the charge can remain for a long time. This effect causes problems in modern rooms, mines, factories, and aircraft fuel supply systems.


statics
statistic f

Stillness. The study of bodies and systems in equilibrium under the influence of external forces.


superconductivity
supraconductivity f

Superconductivity. The state of resistance equal to zero, which is available in many metals at a temperature close to absolute zero (-273 C). When a current is released in a superconducting loop, it continues to flow indefinitely as long as the temperature continues to decrease. There is no need for energy transfer to maintain the charge flow and there is no transfer of energy from the loop. Extensive research is now being conducted to use this method to transmit electrical power.


surface tension
tension f superficielle

Surface tension. An almost surface crust-like effect that maintains the consistency of a liquid sample. In fact, the reason for this is cohesion. This tends to give particles near the surface a net force that pushes them inward, as shown below.

Surface tension decreases with increasing temperature. This makes hot liquid evaporate faster than cold liquid. Surface tension is also related to capillarity, which explains why a small drop of liquid tends to take a spherical shape.