Answers

2014-05-14T21:48:38+05:30
Kg per cubic meter...
means how much stored in i 1*1*1 box whose dimensions are unity

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2014-05-14T21:58:55+05:30
Density = mass/volume
it is like the wait  of the object. if it is more it  sinks in the water.
it is common sense like a ball of air...didnt sinks but a ball of metal get sinks in it.because the density of metal ball is more then ball of air

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