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What are the uses of mass and volume measurements?

What else can be determined from mass and volume?
One way mass and volume are used in describing matter is concentration

If we add something to a liquid, and we know its mass and the volume of the liquid, then we can calculate the concentration (c) by dividing the mass (m) 
by the volume (v) of the liquid containing the mass.  The equation for this calculation is: 

concentration = mass / volume 
Or, in shorthand: c = m / v 

 volume   /     volume         =          concentration

If there is something in a liquid and we know its mass (m) and its concentration (c), we can calculate the volume (v) of the liquid by using algebra to re-arrange the equation, as follows: 

volume = mass / concentration
In shorthand: v = m / c

Do you know how this equation was re-arranged?  Maybe not if you have not had algebra yet. The answer is simple, but it takes two steps. First, multiply both sides by "v" to produce v x c = m. Then divide both sides by "c." 

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