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Glossary of Physics Terms
beginning with letter D
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Dalton Tweet Definition of Dalton Like Definition of Dalton on Facebook
noun
  1. (chemistry) a former unit of atomic mass equivalent to 1/16 the mass of an oxygen atom; now replaced by the atomic mass unit (or dalton)
proper noun
  1. w:John Dalton, John Dalton, English chemist
  2. any of several place names in the north of England and in Scotland
  3. (given name, male) from the surname.
DAMP Tweet Definition of DAMP Like Definition of DAMP on Facebook
abbreviation
  1. Deficits in Attention, Motor coordination and Perception.
DB Tweet Definition of DB Like Definition of DB on Facebook
initialism
  1. database
    1. Deutsche Bahn (German Railways)
DBA Tweet Definition of DBA Like Definition of DBA on Facebook
initialism
  1. (computing) database analyst
  2. (computing) database administrator
    1. doing business as
    2. daily benefit amount
decay Tweet Definition of decay Like Definition of decay on Facebook
noun
  1. A deterioration of condition or plaque on ones teeth.
verb
  1. To deteriorate, to get worse, to lose strength or health, to decline in quality.
  2. To rot, To go bad.
decibel Tweet Definition of decibel Like Definition of decibel on Facebook
noun
  1. a common measure of sound intensity that is 1 tenth of a Bel on the logarithmic intensity scale. It is defined as dB = 10
    • log10(P 1/P 2), where P1 and P2 are the relative powers of the sound.
Dee Tweet Definition of Dee Like Definition of Dee on Facebook
proper noun
  1. (rivers) A river in Scotland that flows about 145 km (90 mi) from the Cairngorm Mountains to the North Sea at Aberdeen.
  2. (rivers) A river in Wales and England that flows about 113 km (70 mi) from Snowdonia to the Irish Sea near Liverpool.
  1. A female given name.
degeneracy Tweet Definition of degeneracy Like Definition of degeneracy on Facebook
noun (degeneracies)
  1. the state of being degenerate (in all senses)
delayed Tweet Definition of delayed Like Definition of delayed on Facebook
verb
  1. Past tense and past participle of delay.
delta particle Tweet Definition of delta particle Like Definition of delta particle on Facebook
noun
  1. A hyperon of short life.
denature Tweet Definition of denature Like Definition of denature on Facebook
verb (denatures, denaturing, denatured, denatured)
  1. to take away a natural characteristic or inherent property of a thing or a person
  2. (in reference to alcohol) to add something that makes alcohol unsuitable for consumption but leaves the alcohol suitable for other purposes
    • While you cannot drink denatured alcohol, you can still use it to remove sticker glue from most surfaces.
density Tweet Definition of density Like Definition of density on Facebook
noun (pl=densities)
  1. A measure of the amount of matter contained by a given volume.
  2. The ratio of the number particles or total amount of such a quantity as energy or momentum, carried by or contained in a volume , to that volume.
deuteron Tweet Definition of deuteron Like Definition of deuteron on Facebook
noun
  1. (physics) the atomic nucleus of a deuterium atom, consisting of a proton and a neutron
diaphragm Tweet Definition of diaphragm Like Definition of diaphragm on Facebook
noun
  1. (anatomy) In mammals, a sheet of muscle separating the thorax from the abdomen, contracted and relaxed in respiration to draw air into and expel air from the lungs.
  2. (mechanics) A flexible membrane separating two chambers and fixed around its periphery that distends into one or other chamber depending on the as the difference in the pressure in the chambers varies.
  3. A contraceptive device consisting of a flexible cup, used to cover the cervix during intercourse.
differential Tweet Definition of differential Like Definition of differential on Facebook
noun
  1. the differential gear in an automobile etc
  2. a qualitative or quantitative difference between similar or comparable things
  1. (mathematics) an infinitesimal change in a variable, or the result of differentiation
adjective
  1. of, or relating to a difference
  2. dependent on, or making a difference; distinctive
  3. having differences in speed or direction of motion
  1. (mathematics) of, or relating to differentiation, or the differential calculus
diffraction Tweet Definition of diffraction Like Definition of diffraction on Facebook
noun
  1. (context, quantum mechanics) The breaking up of an electromagnetic wave as it passes a geometric structure (e.g. a slit), followed by reconstruction of the wave by interference.
diffraction grating Tweet Definition of diffraction grating Like Definition of diffraction grating on Facebook
noun (pluraldiffraction gratings)
  1. (physics) a surface having a large number of closely spaced lines or slits; used to produce optical spectra by mutual interference
diffuse Tweet Definition of diffuse Like Definition of diffuse on Facebook
verb (diffus, ing)
  1. (transitive) To spread over or through as in air, water, or other matter, especially by fluid motion or passive means.
  2. (intransitive) To be spread over or through as in air, water, or other matter, especially by fluid motion or passive means.
Food coloring diffuses in water.
The riot diffused quite suddenly.
adjective
  1. Everywhere or throughout everything; not focused or concentrated.
Such a effort is unlikely to produce good results.
dilatometer Tweet Definition of dilatometer Like Definition of dilatometer on Facebook
noun
  1. An instrument used to measure the expansion of solids and liquids when heated
dimension Tweet Definition of dimension Like Definition of dimension on Facebook
noun
  1. A single aspect of a given thing.
  2. A measure of spatial extent in a particular direction, such as height, width or breadth, or depth.
  3. A construct whereby objects or individuals can be distinguished.
  4. (geometry) Any of the independent coordinates used to specify uniquely the location of a point in a space.
  5. (linear algebra) The number of elements of any basis of a vector space.
  6. (physics) One of the physical property regarded as a fundamental measure of a physical quantity, such as mass, length and time.
The dimensions of velocity are length divided by time.
  1. (computing) Any of the independent ranges of index, indices in a multidimensional array.
  2. (science fiction) An alternative universe or plane of existence.
verb
  1. (transitive) To mark, cut or shape something to specified dimensions.
dimensional analysis Tweet Definition of dimensional analysis Like Definition of dimensional analysis on Facebook
noun
  1. (physics) The study of the dimensions of physical quantities; used to obtain information about large complex systems, and as a means of checking mathematical and physics equations.
disintegration Tweet Definition of disintegration Like Definition of disintegration on Facebook
noun
  1. The process by which anything is disintegrated; the condition of anything which is disintegrated.
  2. The wearing away or falling to pieces of rocks or strata, produced by atmospheric action, frost, ice, etc.
Doppler effect Tweet Definition of Doppler effect Like Definition of Doppler effect on Facebook
noun
  1. The apparent change in frequency or wavelength of a wave that is perceived by an observer moving relative to the source of the waves
dosimeter Tweet Definition of dosimeter Like Definition of dosimeter on Facebook
noun
  1. A device used to measure a dose of ionising radiation. These normally take the form of either Optically Stimulated Luminescence (OSL), photographic film, thermoluminescent devices (TLD) or electronic personal dosimeters (PDM).
dosimetry Tweet Definition of dosimetry Like Definition of dosimetry on Facebook
noun
  1. the measurement of doses, especially of ionizing radiation
downdraft Tweet Definition of downdraft Like Definition of downdraft on Facebook
noun
  1. a strong, downward air current; an air pocket or air hole
down quark Tweet Definition of down quark Like Definition of down quark on Facebook
noun
  1. (particles) A quark having a fractional electric charge of -1/3 and a mass about 4 to 8 MeV?. Symbol: d
drift Tweet Definition of drift Like Definition of drift on Facebook
noun
  1. The act or motion of drifting; the force which impels or drives; an overpowering influence or impulse.
  2. A place, also known as a ford, along a river where the water is shallow enough to permit oxen or sheep to be driven to the opposite side.
  3. Course or direction along which anything is driven; setting.
  4. The tendency of an act, argument, course of conduct, or the like; object aimed at or intended; intention; hence, also, import or meaning of a sentence or discourse; aim.
  5. That which is driven, forced, or urged along
  6. Anything driven at random.
  7. A mass of matter which has been driven or forced onward together in a body, or thrown together in a heap, etc., esp. by wind or water; as, a drift of snow, of ice, of sand, and the like.
  8. A drove or flock, as of cattle, sheep, birds.
  9. The horizontal thrust or pressure of an arch or vault upon the abutments.
  10. A collection of loose earth and rocks, or boulders, which have been distributed over large portions of the earth's surface, especially in latitudes north of forty degrees, by the agency of ice.
  11. In South Africa, a ford in a river.
  12. A slightly tapered tool of steel for enlarging or shaping a hole in metal, by being forced or driven into or through it; a broach.
  13. A tool used in driving down compactly the composition contained in a rocket, or like firework.
  14. A deviation from the line of fire, peculiar to oblong projectiles.
  15. A passage driven or cut between shaft and shaft; a driftway; a small subterranean gallery; an adit or tunnel.
  16. The distance through which a current flows in a given time.
  17. The angle which the line of a ship's motion makes with the meridian, in drifting.
  18. The distance to which a vessel is carried off from her desired course by the wind, currents, or other causes.
  19. The place in a deep-waisted vessel where the sheer is raised and the rail is cut off, and usually terminated with a scroll, or driftpiece.
  20. The distance between the two blocks of a tackle.
  21. The difference between the size of a bolt and the hole into which it is driven, or between the circumference of a hoop and that of the mast on which it is to be driven.
  22. A sideways movement of the ball through the air, when bowled by a spin bowler.
  23. Driftwood, driftwood included in flotsam washed up onto the beach.
  24. Driftless Area, Drift (see Wikipedia). The material left behind by the retreat of continenal glaciers. It buries former river valleys and creates young river valleys. The Diftless Area, a geographical area of North America, was unglaciated for the past 510 million years. Mass noun.
verb
  1. To move slowly, pushed by currents of water, air, etc
The boat drifted away from the shore.
The balloon was drifting in the breeze.
  1. To move haphazardly without any destination.
''He drifted from town to town, never settling down.
  1. To deviate gently from the intended direction of travel.
''This car tends to drift left at high speeds
ductile Tweet Definition of ductile Like Definition of ductile on Facebook
adjective
  1. Capable of having its shape changed permanently by means of applied mechanical force.
dynamic Tweet Definition of dynamic Like Definition of dynamic on Facebook
noun
  1. A characteristic or manner of an interaction; a behavior.
Watch the between the husband and wife when they disagree.
The study of fluid dynamics quantifies turbulent and laminar flows.
  1. (music) The varying loudness or volume of a song or the markings that indicate the loudness.
If you pay attention to the dynamics as you play, it's a very moving piece.
  1. (music) A symbol in a musical score that indicates the desired level of volume.
adjective
  1. changeable, Changeable; active; in motion.
The environment is , changing with the years and the seasons.
He was a and engaging speaker.
  1. powerful, Powerful
  2. Able to change and to adapt (also in computing)
  3. (music) Having to do with the volume of sound.
The marking in bar 40 is forte.
dyne Tweet Definition of dyne Like Definition of dyne on Facebook
noun
  1. A unit of force in the CGS system that is equal to the force which generates a velocity of one centimeter per second acting on one gram for one second. Symbol: dyn.

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