No. 17,361 in Russian
твердость
Firmness or hardness.
In a sentence
Твердость стали определяет её прочность.
The hardness of steel determines its strength.
In this sentence, 'твердость' is used in a physical context to talk about the material property of steel, referring to its hardness.
Твердость его характера помогла ему преодолеть трудности.
The firmness of his character helped him overcome difficulties.
Here, 'твердость' describes an abstract quality of a person, reflecting resoluteness or determination.
Учёные исследовали метод измерения твердости материалов.
Scientists studied the method of measuring the hardness of materials.
This usage of 'твердость' again pertains to its technical meaning as a physical attribute being tested or measured.
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