How do mass and density relate in iron blocks when volume changes?

[jaan]

a block of iron defined by parameters mass,volume and density.when volume is doubled,the mass is also doubled;but the density of doubled volume of iron block remains the same.how do you distinguish the parameters mass and density.give any example (may be 2 or 3),so that i can understand well
thank u for taking ur valuable time.

 

[gnpatterson]

are you asking about intrinsic vs extrinsic? http://plato.stanford.edu/entries/intrinsic-extrinsic/

 

[arildno]

The density is the RATIO between mass and volume, \rho_{1}=\frac{m_{1}}{V_{1}}
where \rho_{1} stands for density for the first block, m_{1},V_{1} mass and volume for block 1 respectively.
If we look at a block 2 with twice the mass of block 1, that is m_{2}= 2m_{1}, and doubled volume V_{2}=2V_{1}, the density of this block is:
\rho_{2}=\frac{m_{2}}{V_{2}}=\frac{2m_{1}}{2V_{1}}=\frac{m_{1}}{V_{1}}=\rho_{1}
that is, the densities of the blocks are equal.

 

[jaan]

iam speaking statistically

as per STATISTICAL MECHANICS APPLY UR idea and can u eloborate the physical situation.
thank u