Physics

Dictionary - E


  • boiling: Transformation of a liquid into steam operated on the liquid mass itself in the form of bubbles. Development of air bubbles in a liquid subject to heating.
  • echo: More or less clear repetition of a sound reflected by a body. Sound repeated. Repetition.
  • electricity: A form of natural energy, linked to electrons, manifested by attractions and repulsions, and luminous, chemical and mechanical phenomena. It exists in potential state (static electricity) as charge (voltage), or in kinetic form (dynamic electricity) as current.
  • electromagnetism: Study of the relations of magnetism with electricity. Magnetism developed by an electric current.
  • electronics: Branch of physics that deals with the emission, behavior and effects of electrons, especially in vacuum and gases.
  • Ellipse: Section of a circular cone straight through an oblique plane in relation to the axis that meets all the geratrices. Characteristic of the ellipse is to be constant the sum of the distances from any of its points to the two foci.
  • buoyancy: Upwardly directed vertical force acting on an immersed body passing through its center of gravity and equal to the weight of the displaced liquid volume.
  • energy: Ability of bodies to produce work or develop strength.
  • entropy: Amount of energy of a system, which cannot be converted into mechanical work without heat communication to another body, or without volume change. Entropy increases in all irreversible processes and stays constant in reversibles.
  • equation: Equality statement of two expressions linked by the equal sign (=), which only applies to certain values ​​of the unknowns contained therein. The equations are called the 1O, 2O, 3O, 4O etc. degrees, according to the exponent of the greatest power of the unknown.
  • scale: Series of spaces separated by dashes or points, used to measure distances or quantities. Graduation of certain instruments, such as the thermometer and barometer, by which their indications are read. Line or strip divided into equal parts, which indicates such proportion and is placed at the bottom of a map or plan.
  • space: Unlimited or infinitely large three-dimensional extension, which contains all beings and things and is the field of all events. The whole universe beyond Earth's atmospheric envelope; the near vacuum of the solar system, the stars, the nebulae and the galaxies. Portion of this extension at a given moment (such as the space occupied by a body; the space within a hollow sphere; a space of ten cubic meters); volume. Limited extension in three dimensions
  • static (o): Relative or pertaining to static. Relative or belonging to bodies at rest or forces in equilibrium, as opposed to dynamic. In rest; immobile. In equilibrium; stable. Non-dynamic.
  • stratosphere: Atmospheric layer, whose lower limit ranges from 5 to 20 km and the upper limit is undefined, but generally considered to be about 100 km above the Earth's surface.
  • evaporation: Transformation of a liquid into steam operated on the liquid mass itself in the form of bubbles. Development of air bubbles in a liquid subject to heating.
  • exosphere: Highest layer of the atmosphere, in which air particles circulate in elliptical orbits without frequent collisions. It represents approximately 1/3000 of the Earth's atmosphere, in terms of mass, and is located from 1000 km high.
  • expansion: dilation of dimensions or volume.