## its really confusing me alot

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.
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 Recognitions: Gold Member Homework Help Science Advisor 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.