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Glossary of Physics Terms
beginning with letter E
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E Tweet Definition of E Like Definition of E on Facebook
noun
echolocation Tweet Definition of echolocation Like Definition of echolocation on Facebook
noun
  1. The use of echoes to detect objects as observed in bats and other natural creatures. Also known as biosonar.
Eddy Tweet Definition of Eddy Like Definition of Eddy on Facebook
proper noun
  1. (given name, male), diminutive of Edward.
effusion Tweet Definition of effusion Like Definition of effusion on Facebook
noun
  1. an outpouring of liquid
  2. (context, by extension) an outpouring of speech or emotion
    • 1930; George S. Kaufman, Morrie Ryskind, Bert Kalmar, Harry Ruby; Animal Crackers, Paramount Pictures
    • : Captain Spaulding: My friends, I am highly gratified by this magnificent display of ...
      1. (medicine) the seeping of fluid into a body cavity; the fluid itself
eightfold way Tweet Definition of eightfold way Like Definition of eightfold way on Facebook
noun
  1. (physics) a theory that organizes subatomic particles into octets
Einsteinian Tweet Definition of Einsteinian Like Definition of Einsteinian on Facebook
adjective
  1. Of or relating to the theory, theories of the Wikipedia:Theoretical physics, theoretical physicist Wikipedia:Albert Einstein, Albert Einstein.
elastic Tweet Definition of elastic Like Definition of elastic on Facebook
noun (countable and uncountable; pluralelastics)
  1. (uncountable) An elastic material used in clothing, particularly in waistbands and cuffs.
Running shorts use elastic to eliminate the need for a belt.
  1. (countable) An elastic band.
adjective ((compar) more elastic, (superl) most elastic)
  1. Capable of stretching; particularly, capable of stretching so as to return to an original shape or size when force is released.
The rope is somewhat elastic, so expect it to give when you pull on it.
  1. Made of elastic.
elastic band
  1. Of clothing, elasticated.
  2. (economics) Sensitive to changes in price.
Demand for entertainment is more elastic than demand for energy.
elasticity Tweet Definition of elasticity Like Definition of elasticity on Facebook
noun
  1. (physics)The property by virtue of which a material deformed under the load can regain its original dimensions when unloaded
  2. (economics)The sensitivity of changes in a quantity with respect to changes in another quantity.
  3. the quality of being elastic
  4. adaptability
elastic limit Tweet Definition of elastic limit Like Definition of elastic limit on Facebook
noun
  1. (physics) the level of stress at which a solid undergoes a greater change in strain than predicted by Hooke's law; often followed by necking and breaking
electromagnetic radiation Tweet Definition of electromagnetic radiation Like Definition of electromagnetic radiation on Facebook
noun (uncountable)
  1. Radiation consisting of oscillating electric and magnetic fields in oriented perpendicularly to each other, moving through space.
electromagnetic wave Tweet Definition of electromagnetic wave Like Definition of electromagnetic wave on Facebook
noun
  1. (physics) electromagnetic radiation, such as light and radio waves
electron spin resonance Tweet Definition of electron spin resonance Like Definition of electron spin resonance on Facebook
noun (Abbreviated as: ESR)
  1. (physics) The absorption of radiation by species having unpaired electrons when placed in a magnetic field that is used spectroscopically to detect and study free radicals
electrostatics Tweet Definition of electrostatics Like Definition of electrostatics on Facebook
noun
  1. (physics) the branch of physics that deals with static electricity; that is, with the force exerted by an unchanging electric field upon a charged object
energy Tweet Definition of energy Like Definition of energy on Facebook
noun (energies)
  1. The impetus behind all motion and all activity.
  2. The capacity to do work.
  3. (context, physics) A quantity that denotes the ability to do work and is measured in a unit dimensioned in mass Ū— distance¬≤/time¬≤ (ML¬≤/T¬≤) or the equivalent.
    • Units:
      :SI: joule (J), kilowatt-hour (kW·h)
      :CGS: erg (erg)
      :Customary: foot-pound-force, calorie, kilocalorie (i.e. dietary calories), BTU, liter-atmosphere, ton of TNT
energy level Tweet Definition of energy level Like Definition of energy level on Facebook
noun
  1. (physics) any of the discrete stable energies that a quantum mechanical system (such as the electrons of an atom) can have
epoch Tweet Definition of epoch Like Definition of epoch on Facebook
noun
  1. A particular period of history, especially one considered remarkable or noteworthy.
  2. A notable event which marks the beginning of such a period.
  3. (astronomy) A precise instant of time that is used as a reference point.
  4. (context, computing, uncountable) January 1, 1970, 00:00:00 GMT
equilibrant Tweet Definition of equilibrant Like Definition of equilibrant on Facebook
noun
  1. A force equal to, but opposite of, the resultant sum of vector forces; that force which balances other forces, thus bringing an object to equilibrium.
equivalence principle Tweet Definition of equivalence principle Like Definition of equivalence principle on Facebook
noun
  1. (physics) any of several principles, in relativity, concerned with the uniformity of physical measurements in different frame of reference, frames of reference
erg Tweet Definition of erg Like Definition of erg on Facebook
noun
  1. The unit of work or energy, being the amount of work done by a dyne working through a distance of one centimeter.
ESR Tweet Definition of ESR Like Definition of ESR on Facebook
initialism
  1. electron spin resonance
evacuate Tweet Definition of evacuate Like Definition of evacuate on Facebook
verb (evacuat, es)
  1. To make empty; to empty out; to remove the contents of; as, to evacuate a vessel or dish.
  2. Fig.: To make empty; to deprive.
  3. To remove; to eject; to void; to discharge, as the contents of a vessel, or of the bowels.
  4. To withdraw from; to quit; to retire from; as, soldiers from a country, city, or fortress
evaporable Tweet Definition of evaporable Like Definition of evaporable on Facebook
adjective
  1. capable of evaporation
evaporate Tweet Definition of evaporate Like Definition of evaporate on Facebook
verb (evaporat, ing)
  1. The transition from a liquid state into a gaseous state.
evaporation Tweet Definition of evaporation Like Definition of evaporation on Facebook
noun
  1. The process of a liquid converting to the gaseous state.
  2. The process in which all or a portion of liquid (in a container) is turned into vapour, in order to increase the concentration of solid matter in the mixture.
  3. (context, archaic) That which is evaporated; vapour.
evaporimeter Tweet Definition of evaporimeter Like Definition of evaporimeter on Facebook
noun
  1. An atmometer
event Tweet Definition of event Like Definition of event on Facebook
noun
  1. An occurrence of social or personal importance.
  2. (physics) A point in spacetime having three spatial coordinates and one temporal coordinate
excitation Tweet Definition of excitation Like Definition of excitation on Facebook
noun
  1. The act of exciting or putting in motion; the act of rousing up or awakening.
  2. The act of producing excitement (stimulation); also, the excitement produced.
  3. Physiology. The activity produced in an organ, tissue, or part, such as a nerve cell, as a result of stimulation
  4. (physics) The change in state as an excited state is formed by the absorption of a quantum of energy
excited state Tweet Definition of excited state Like Definition of excited state on Facebook
noun
  1. (physics) any state of a particle or system of particles that has a higher energy that that of its ground state
excursion Tweet Definition of excursion Like Definition of excursion on Facebook
noun
  1. a brief recreational trip; a journey out of the usual way
    • While driving home I took an and saw some deer.
exhaust Tweet Definition of exhaust Like Definition of exhaust on Facebook
noun
  1. System consisting of the parts of an engine through which burned gases or steam are discharged
  2. The steam let out of a cylinder after it has done its work there.
  3. The foul air let out of a room through a register or pipe provided for the purpose.
  4. An exhaust pipe, especially on a motor vehicle.
verb
  1. To draw or let out wholly; to drain off completely; as, to exhaust the water of a well; the moisture of the earth is exhausted by evaporation.
  2. To empty by drawing or letting out the contents; as, to exhaust a well, or a treasury.
  3. To drain, metaphorically; to use or expend wholly, or till the supply comes to an end; to deprive wholly of strength; to use up; to weary or tire out; to wear out; as, to exhaust one's strength, patience, or resources.
A decrepit, exhausted old man at fifty-five. --Motley.
  1. To bring out or develop completely; to discuss thoroughly; as, to exhaust a subject.
  2. (chemistry) To subject to the action of various solvents in order to remove all soluble substances or extractives; as, to exhaust a drug successively with water, alcohol, and ether.
extension Tweet Definition of extension Like Definition of extension on Facebook
noun
  1. The act of extending or the state of being extended; a stretching out; enlargement in breadth or continuation of length; increase; augmentation; expansion.
  2. That property of a body by which it occupies a portion of space (or time, e.g. "spatiotemporal extension")
  3. Capacity of a concept or general term to include a greater or smaller number of objects; -- correlative of intension. Synonymous with denotation.
  4. A written engagement on the part of a creditor, allowing a debtor further time to pay a debt.
  5. The operation of stretching a broken bone so as to bring the fragments into the same straight line.
  6. (weightlifting) An exercise in which an arm or leg is straightened against resistance.
  7. (fencing) A simple offensive action, consisting of extending the weapon arm forward.
  8. A numerical code used to specify a specific telephone in a telecommunication network.

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