For the same reason a pen is not a pencil.
Mass = weight
Volume = how much space it takes up.
Ask yourself this question.
What weighs more, a pound of lead, or a pound of feathers?
Imagine it in your head, what each would look like and that gives you the answer.
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Volume = mass / Density Mass = Volume * Density Density = Mass / Volume
density = mass / volume Solving for mass: mass = density x volume Solving for volume: volume = mass / density
Density = mass/volume Mass = (density) x (volume) Volume = mass/density
since density equal to mass/volume then mass=density times volume mathematically mass=density *volume
Density = Mass / Volume Mass = Density * Volume Volume = Mass / Density