Whats the question so i can answer...
Answer:
Density is a word we use to describe how much space an object or substance takes up (its volume) in relation to the amount of matter in that object or substance (its mass). Another way to put it is that density is the amount of mass per unit of volume.
Well it depends on how well you take care of it, they don't really have a certin amount of times that you can use it un'till you have to get rid of it
