Answer:
The correct answer is:How much mass per unit of volume is in a substance
Step-by-step explanation:
Density is defined as the ratio of mass of the substance to the unit volume occupied of the substance .
Mathematically written as:
![Density=(Mass)/(Volume)](https://img.qammunity.org/2020/formulas/chemistry/middle-school/hzknnknzlihjnnp7o4jwkew5bpcuhffxxx.png)
It can be also defined mass of substance present in the unit volume of the substance.