सतहों पर साबुन और डिटर्जेंट की सफाई की क्रिया मुख्य रूप से किस सिद्धांत पर आधारित होती 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?