Definition of flux in English:



  • 1mass noun The action or process of flowing or flowing out.

    ‘the flux of ions across the membrane’
    • ‘Consequently, reducing enzyme activity by much as 50% has a negligible effect on flux through the pathway.’
    • ‘This might be the case with flux through aluminium foil into which holes have been punched, for example.’
    • ‘Impressionism arose from the tension between a focused, stabilizing attention on the one hand, and the continuous flux of sensation on the other.’
    • ‘A high sensitivity coefficient for a particular enzyme indicates that this enzyme exerts a strong control over flux through the pathway.’
    • ‘Second, the population flux will converge towards those countries that provide the more generous social benefits or the best living conditions.’
    • ‘When the SERCA pump is more active, the net flux of calcium into the cytosol decreases.’
    • ‘Regardless of the mechanism involved, these studies make it clear that varying the protein levels of EIN3 serves as an important means to control flux through the signalling pathway.’
    • ‘Although not proven, it is logical to assume that capillary basement membrane thickening impairs the flux of nutrients and possibly the migration of white blood cells.’
    • ‘The calculated water flux shows qualitative agreement with experimental findings for water flux through stratum comeum.’
    • ‘Moreover, this isotope could be useful as a tracer of the flux of organic matter in ocean surface waters.’
    • ‘They do so by adjusting the flux of hormones in the host's body, so that it just keeps growing into an oversized infant.’
    • ‘Roots from detopped tomato plants were inserted in a chamber under constant pressure and sap flux was measured continuously.’
    • ‘The authors explain that this is an indication of an enhanced metabolic flux through cysteine to glutathione in all groups of transgenic plants.’
    • ‘In that case, the Lipobead membrane restricted flux of both calcium and the indicator dye Fluo - 3.’
    • ‘The model presented here is focused on interpreting the mechanism and resulting dynamics of the solute per se so it will be further assumed that there is no radial flux of solute through the tube walls.’
    • ‘Studies of contemporary ice sheets show that the pattern of ice flux within ice streams has a profound effect on mass balance, flow configuration and ice divide positions.’
    • ‘The increasing flux of people out of the country determined the GDR government to close the border into the FRG.’
    • ‘The flux of ammonium through the photorespiratory nitrogen cycle has been estimated to be 10 times higher than that resulting from primary assimilation.’
    • ‘The measurement of residence times requires a knowledge of the flux of a species into the reservoir, the amount of the species within the reservoir, and the flux of the species out of the reservoir.’
    • ‘Human perception is merely included within the flux of images that is reality.’
    outflow, outpouring, outflowing, outrush, rush, current, flood, deluge, emission, discharge, issue
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    1. 1.1Physics The rate of flow of a fluid, radiant energy, or particles across a given area.
      • ‘Why is the solar neutrino flux less than half its expected value?’
      • ‘The energy flux was measured with a short-wave ultraviolet intensity meter (UVP, USA).’
      • ‘Now we use Wien's law to calculate the wavelength of the maximum energy flux for these temperatures.’
      • ‘A photodiode is mounted on the integrating sphere to measure the radiant flux from the diode laser entering the sphere.’
      • ‘Plasma membrane stress failure is but one of many stimuli that trigger cell remodeling and thereby mediate changes in fluid flux across the vascular wall.’
      flow, movement, motion, transfer, course, passage, current, drift, circulation, trickle, stream, swirl, surge, sweep, gush, roll, rush, welling, spate, tide
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    2. 1.2 The amount of radiation or particles incident on an area in a given time.
      • ‘Such a measurement, the fluence rate, is defined as the radiation flux from all directions incident on a small sphere in space.’
      • ‘If not then to figure out how dangerous is this to you, you need to know how much of the radiation flux reaches your storage unit and how much time you spend in your storage unit.’
      • ‘All fluorescent lamps used as sources for UV-B radiation necessarily emit UV-C, UV-A and a small flux of blue visible radiation.’
      • ‘For the Sun, there is no ambiguity: no such settling could explain the enormous radiated flux of light.’
      • ‘But an increase in light flux did lead to degradation of the dyes.’
    3. 1.3 The total electric or magnetic field passing through a surface.
      • ‘Thus, by Faraday's law, which states that a changing magnetic flux induces an electrical field, hence a current is established in the wires which wrap the pickup magnet.’
      • ‘If the magnetic flux of the body becomes stronger, cells attract more strongly to each other and therefore create a denser reunion.’
      • ‘The magnetic flux quanta can create specific magnetic profiles within a given sample or device, according to Nori and Savel'ev.’
      • ‘The magnetic flux is measured by external coils, from which the conductivity inside the object can be calculated.’
      • ‘Alternatively, actively powered Hall effect sensors can measure the absolute magnetic flux.’
  • 2Medicine
    An abnormal discharge of blood or other matter from or within the body.

    • ‘A list of patients admitted during the hospital's first years shows that reasons for admission included hysterick disorders, bloody flux, tertian ague, and melancholy.’
    • ‘Vasoconstriction of the vessel and fall of pressure slow the blood flux, and immediately, a seal is started.’
    • ‘It continued till my coming here to Berwick, and then became so vehement, turning to a flux of blood with so great pain as was possible, that I was constrained to keep my bed 15 days.’
    discharge, outflowing, outpouring, outrush, rush, flood, deluge, issue, spurt, jet, cascade, stream, torrent, gush, outburst
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    1. 2.1usually the fluxarchaic Diarrhoea or dysentery.
      • ‘Both of them are ill with the flux.’
  • 3mass noun Continuous change.

    ‘since the fall of the wall Berlin has been a city in flux’
    ‘the whole political system is in a state of flux’
    • ‘The industry's current state of flux - some companies losing staff, others recruiting heavily - means that there is now a great deal of potential for building new teams.’
    • ‘Reynolds agrees that higher education is in a period of flux regarding the issues that are dearest to her heart.’
    • ‘This time Hearts wanted him, too, but for a man searching for stability, the Tynecastle club's current state of flux must have been disconcerting.’
    • ‘The governments are in flux and continuity cannot be guaranteed.’
    • ‘Changing business practices leave the communications process in flux.’
    • ‘The book begins with a re-interpretation of the post-Cold War international system firmly placing the current state of flux and change in an arena of global disorder.’
    • ‘One symptom of the present flux and uncertainty in American life can be found at the box office.’
    • ‘Challenges abound, from a review process still in flux to issues of libel and copyright.’
    • ‘My views on this issue are still in flux, so I'm just going to present a link to this article by Andrew Sullivan without much comment.’
    • ‘Professional golfers in India are going through a period of flux.’
    • ‘With youth culture constantly going through a state of flux and change it is a relief to have contemporary specialists to talk with.’
    • ‘Wolfson, on the other hand, argued that marriage has been in a state of flux throughout American history, and has undergone four major redefinitions in the past century.’
    • ‘The capital is a city in permanent flux like no other, experiencing a constant process of generational and demographic change.’
    • ‘While downtown everything is in flux, in a rush, trying to emulate the fluidity and energy of the West, here everything is tranquil and fixed.’
    • ‘Caribbean civilization represents the meeting of Old and New Worlds and the freshness of being ever caught up in a creative whirlpool of constant flux.’
    • ‘This world is luminous with suffering; everything is fragile, prone to flux.’
    • ‘Are there different kinds of roles you play in the creative process, or is that in flux as well?’
    • ‘It's the study and analysis of that flux that seem to have become his life's work.’
    • ‘The list is in a state of flux and will continue to be.’
    • ‘Instead we have to appreciate that social order is constantly fluid, ever in flux.’
    continuous change, changeability, changeableness, variability, inconstancy, fluidity, instability, unsteadiness, unpredictability, irregularity, fitfulness, unreliability, fickleness
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  • 4A substance mixed with a solid to lower its melting point, used especially in soldering and brazing metals or to promote vitrification in glass or ceramics.

    • ‘This problem is particularly acute in the automobile industry where the rosin used in soldering flux, varnishes, lacquers and surface finishes is thought to be a major cause of dermatitis.’
    • ‘In the case of oxidation-resistant metals the reaction is facilitated by the use of a chemical flux or metal powder.’
    • ‘In place of the special fluxes a simple mixture of silver chloride and potassium chloride or manganese chloride and potassium chloride is sufficient.’
    • ‘Later imitators did produce high temperature ceramics using such fluxes, such as bone porcelain, like Beleek.’
    • ‘The water acts as a simple flux to lower the melting point of some minerals.’
    1. 4.1 A substance added to a furnace during metal-smelting or glass-making which combines with impurities to form slag.
      • ‘An amount of flux is added to the crucible and the mixture is fused at high temperature in the furnace.’
      • ‘During iron making, iron ore, coke heated air and limestone or other fluxes are fed into a blast furnace.’
      • ‘Lead has been removed from copper alloy melts by the application of silicate fluxes or slags.’
      • ‘These materials are the glass-forming substances, fluxes, stabilizers, and secondary components.’
      • ‘Rotary furnaces generally use Na 2 CO 3 and iron as fluxes, which produce a fluid, low-melting slag.’
      • ‘Slaked lime is an important flux in the reduction of iron in blast furnaces.’


[with object]
  • Treat (a metal object) with a flux to promote melting.

    • ‘The face of the backing would be scoured clean and fluxed.’
    • ‘It was considered such ideal fluxing ore that the El Paso smelter paid the costs for shipping it by rail and processed the ore at no charge to assure a steady supply.’
    • ‘Fluorite was not an economic commodity until the advent of modern steel-making processes during the late nineteenth century created a demand for it as a fluxing agent.’
    • ‘The zinc alloys melt in less time and do not require fluxing or degassing as is common with aluminum alloys.’
    • ‘After fluxing, all dirt and impurities will float on top of the melt, and may be skimmed off with the ladle.’


Late Middle English: from Latin fluxus, from fluere ‘to flow’.