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Concentration
In chemistry, concentration is the abundance of a constituent divided by the total volume of a mixture. Several types of mathematical description can be distinguished: mass concentration, molar concentration, number concentration, and volume concentration. A concentration can be any kind of chemical mixture, but most frequently solutes and solvents in solutions. The molar (amount) concentration has variants such as normal concentration and osmotic concentration.
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Focus (noun)
A point at which reflected or refracted rays of light converge.
“The heat of sunlight at the focus of a magnifying glass can easily set dry leaves on fire.”
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Focus (noun)
A point of a conic at which rays reflected from a curve or surface converge.
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Focus (noun)
The fact of the convergence of light on the photographic medium.
“Unfortunately, the license plate is out of focus in this image.”
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Focus (noun)
The quality of the convergence of light on the photographic medium.
“During this scene, the boy’s face shifts subtly from soft focus into sharp focus.”
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Focus (noun)
Concentration of attention.
“I believe I can bring the high degree of focus required for this important job.”
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Focus (noun)
The exact point of where an earthquake occurs, in three dimensions (underneath the epicentre).
“The earthquake’s focus was at exactly 37 degrees north, 18 degrees south, seventy five meters below the ground.”
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Focus (noun)
The indicator of the currently active element in a user interface.
“Text entered at the keyboard or pasted from a clipboard is sent to the component which currently has the focus.”
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Focus (noun)
The most important word or phrase in a sentence or passage, or the one that imparts information.
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Focus (verb)
To cause (rays of light, etc) to converge at a single point.
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Focus (verb)
To adjust (a lens, an optical instrument) in order to position an image with respect to the focal plane.
“You’ll need to focus the microscope carefully in order to capture the full detail of this surface.”
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Focus (verb)
To concentrate one’s attention.
“Focus on passing the test.”
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Focus (verb)
To concentrate one’s attention.
“If you’re going to beat your competitors, you need to focus.”
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Focus (verb)
To transfer the input focus to (a visual element), so that it receives subsequent input.
“The text box won’t receive the user’s keystrokes unless you explicitly focus it.”
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Concentration (noun)
The act, process or ability of concentrating; the process of becoming concentrated, or the state of being concentrated.
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Concentration (noun)
The direction of attention to a specific object.
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Concentration (noun)
The act, process or product of reducing the volume of a liquid, as by evaporation.
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Concentration (noun)
A field or course of study on which one focuses, especially as a student in a college or university.
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Concentration (noun)
The proportion of a substance in a whole.
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Concentration (noun)
The act or process of removing the dress of ore and of reducing the valuable part to smaller compass, as by currents of air or water.
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Concentration (noun)
The matching game pelmanism.
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Focus (noun)
the centre of interest or activity
“this generation has made the environment a focus of attention”
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Focus (noun)
an act of concentrating interest or activity on something
“our focus on the customer’s requirements”
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Focus (noun)
the point of origin of an earthquake.
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Focus (noun)
the principal site of an infection or other disease.
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Focus (noun)
the state or quality of having or producing clear visual definition
“his face is rather out of focus”
“the incident brought her feelings for Alexander sharply into focus”
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Focus (noun)
another term for focal point
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Focus (noun)
the point at which an object must be situated with respect to a lens or mirror for an image of it to be well defined.
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Focus (noun)
a device on a lens which can be adjusted to produce a clear image.
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Focus (noun)
one of the fixed points from which the distances to any point of a given curve, such as an ellipse or parabola, are connected by a linear relation.
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Focus (noun)
an element of a sentence that is given prominence by intonational or other means.
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Focus (verb)
adapt to the prevailing level of light and become able to see clearly
“try to focus on a stationary object”
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Focus (verb)
cause (one’s eyes) to focus
“she focused her eyes on his face”
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Focus (verb)
adjust the focus of (a telescope, camera, or other instrument)
“they were focusing a telescope on a star”
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Focus (verb)
(of rays or waves) meet at a single point.
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Focus (verb)
(of a lens) make (rays or waves) meet at a single point.
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Focus (verb)
(of light, radio waves, or other energy) become concentrated into a sharp beam.
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Focus (verb)
(of a lens) concentrate (light, radio waves, or energy) into a sharp beam.
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Focus (verb)
pay particular attention to
“the study will focus on a number of areas in Wales”
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Focus (verb)
concentrate
“an opportunity to focus research on the health needs of the population”
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Focus (verb)
place the focus on (an element of a sentence).
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Concentration (noun)
the action or power of focusing all one’s attention
“she was frowning in concentration”
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Concentration (noun)
dealing with one particular thing above all others
“concentration on the needs of the young can mean that the elderly are forgotten”
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Concentration (noun)
a close gathering of people or things
“the island has the greatest concentration of seabirds in the north-west”
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Concentration (noun)
the action of gathering together closely
“the concentration of power in the hands of nobles”
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Concentration (noun)
the relative amount of a particular substance contained within a solution or mixture or in a particular volume of space
“the gas can collect in dangerous concentrations”
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Concentration (noun)
the action of strengthening a solution by the removal or reduction of the diluting agent or by the selective accumulation of atoms or molecules
“by concentration of cell contents and supercooling, frost-hardened plant tissues survive temperatures down to −10°C”