فرسایش
preferred label: erosion @en
type: Concept
related: سختی

تردی
preferred label: brashness @en
type: Concept
related: سختی

آزمایش سختی
preferred label: hardness testing @en
type: Concept
related: سختی

سختی
related: تردی
related: فرسایش
related: سختی آب
related: سفتی
related: آزمایش سختی
type: Concept
preferred label: hardness @en
broader: ویژگی چوب

فرسایش
preferred label: wear @en
type: Concept
related: سختی

سختی آب
preferred label: water hardness @en
type: Concept
related: سختی

تردی
preferred label: tenderness @en
type: Concept
related: سختی

سفتی
preferred label: firmness @en
type: Concept
related: سختی

ویژگی چوب
preferred label: wood properties @en
type: Concept
narrower: سختی