Density is a measure quantity per unit of volume. The quantity most often used is mass per unit volume but can include electric charge per unit volume. At 4 degrees Celsius water has it's highest density of 1 gram per milliliter. In math, if you had 2 liters of water you would have 2000 grams (or 2 KG) of water.
mass = density * volume
mass = 1 g/ml * 1000 ml/l * 2 l
mass = 2000 g
QED
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the identity property of multiplication. from, ace
A*B=B*A is an example of the commutative property of multiplication.
30+6
2x(a+3b)=2xa+6xb
associative property example: (a+b)+c = a+(b+c)