सामग्री का वह गुण जिसके कारण वह लंबे समय तक निरंतर प्रतिबल (constant stress) के तहत धीरे-धीरे विकृत होती रहती है, क्या कहलाता है?

When a bottle of perfume is kept open in a corner of a room, its fragrance is soon felt in all parts of the room. This occurs due to which phenomenon?

The quantity of matter contained in a substance is termed as:

What is the ability of a material, particularly a metal, to resist surface wear, scratching, and abrasion called?