सोने का आपेक्षिक घनत्व 19.3 है। SI मात्रक में इसका घनत्व कितना होगा?

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?