concentration
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concentration
The ability or state of directing all of one's mental attention to a single thing or activity.
Bei dem Lärm fällt mir die Konzentration sehr schwer.
With all that noise, concentration is very difficult for me.
'Die Konzentration' (concentration) is the noun form of the verb 'sich konzentrieren' (to concentrate). Both use the preposition 'auf' with the accusative to name the target of attention.
Ich konzentriere mich auf meine Arbeit.
I concentrate on my work.
The context makes the meaning clear: in everyday life and learning, it is about mental attention. In scientific texts (chemistry, physics), it is about the amount of a substance. In business and sociology, it is about an accumulation.
Für diese Aufgabe brauchst du volle Konzentration.
You need full concentration for this task.
For mental attention, typical verbs are 'die Konzentration stören' (to disturb concentration), 'die Konzentration verlieren' (to lose concentration), 'die Konzentration fördern' (to promote concentration), or 'Konzentration brauchen' (to need concentration).
Laute Musik stört meine Konzentration beim Lesen.
Loud music disturbs my concentration while reading.
In the scientific meaning, the structure 'die Konzentration von [Stoff] in [Medium]' (the concentration of [substance] in [medium]) is often used. Typical adjectives are 'hoch' (high) and 'niedrig' (low).
Die Konzentration von Salz im Meerwasser ist hoch.
The concentration of salt in seawater is high.
content
'der Inhalt' and 'die Konzentration' can both say something about the amount of a substance in a mixture. 'der Inhalt' is more general and is often used when naming the proportion of a substance, for example 'der Zuckerinhalt' (sugar content) or 'der Alkoholinhalt' (alcohol content). 'die Konzentration' is more precise and sounds more technical, especially with solutions, chemistry, medicine, or measurements. Learners may confuse the words because both describe an amount within something else. In everyday language, 'Inhalt' is often easier and more natural; for exact measurements or scientific substances, 'Konzentration' fits better.
Im Labor misst die Ärztin die Konzentration des Wirkstoffs im Blut.
In the lab, the doctor measures the concentration of the active ingredient in the blood.
Der Inhalt an Zucker steht auf der Verpackung des Joghurts.
The sugar content is listed on the yogurt packaging.