strength / firmness
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strength
In physics and materials science, the property of a material to withstand mechanical stresses such as tension or pressure without breaking or permanently deforming.
Die Festigkeit von Stahl ist deutlich höher als die von Aluminium.
The strength of steel is significantly higher than that of aluminum.
firmness
The quality of a person showing strong character, determination, and steadfastness in their convictions or intentions.
Sie bewahrte trotz des großen Drucks die Festigkeit ihrer Überzeugung.
Despite the great pressure, she preserved the firmness of her conviction.
strength / stability
The strength and stability of a bond, relationship, or connection.
Die gemeinsamen Erlebnisse trugen zur Festigkeit ihrer Freundschaft bei.
Their shared experiences contributed to the strength of their friendship.
'Festigkeit' (strength/firmness) is derived from the adjective 'fest' (stable, solid). The ending '-igkeit' turns the adjective into a noun that describes the quality or state of 'being firm/solid.' This basic idea appears in all meanings.
Die Festigkeit des Seils wurde vor dem Klettern geprüft.
The strength of the rope was checked before climbing.
The meaning can be recognized well from context. If it is about materials like metal or wood, the physical property is meant. If people are talking about a person, it refers to strength of character. With relationships like friendship, it refers to the stability of the bond.
Die Ingenieure testen die Festigkeit des Betons.
The engineers are testing the strength of the concrete.
In the meaning of a material property, 'Festigkeit' (strength) is mainly used in technical and scientific fields such as physics, civil engineering, or mechanical engineering.
Für diese Konstruktion benötigen wir ein Material von hoher Festigkeit.
For this construction, we need a material of high strength.
When it is about strength of character, 'Festigkeit' (firmness) is often combined with abstract nouns, for example 'die Festigkeit des Willens' (firmness of will), 'die Festigkeit der Überzeugung' (firmness of conviction), or 'moralische Festigkeit' (moral firmness).
Trotz aller Kritik zeigte sie eine bewundernswerte Festigkeit in ihrer Haltung.
Despite all the criticism, she showed admirable firmness in her position.
strength / starch
Stärke and Festigkeit can both describe a positive quality in a person. Stärke generally refers more to an ability or advantage, while Festigkeit particularly emphasizes determination and steadfastness. Use Stärke for a good quality and Festigkeit for firmly holding to one’s convictions or intentions.
Seine Festigkeit zeigte sich, als er trotz des Drucks an seiner Entscheidung festhielt.
His firmness showed when he stuck to his decision despite the pressure.
Ihre größte Stärke ist, dass sie auch in schwierigen Gesprächen ruhig bleibt.
Her greatest strength is that she remains calm even in difficult conversations.
