The density of a substance is its mass per unit volume. 
a. give a possible metric unit for density. 
b. is the unit for density base or derived?  

Answers:

a)

b) derived

Explanation:

Density is a characteristic property of substances and materials and is defined as the relationship between the mass and volume of a specific substance or material, as shown below:

This means density is inversely proportional to volume.

In addition, density is a derived unit, because is based on two basic units of the International Sistem of Units: Mass (kilograms) and Volume (cubic meters)

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scientific laws are the result of testing theories and proving them to be facts.