Other contributors have said "What are the properties of interest such as density of silver?" is the same question as "What is density in material properties?" If you believe that these are not asking the same thing and should be answered differently, click here
The density of a material is generally typical of a material. The density is it's mass divided by it's volume. So if you have something that weight 20kg and has a volume of 2500cm3 or 2.5L it's...