What is the density of a piece of obsidian that has a mass of 239.2 g and a volume of 92cm3

Density is a value for mass, such as kg, divided by a value for volume, such as m3. Density is a physical property of a substance that represents the mass of that substance per unit volume. To calculate density, we divide the mass with the volume. We do as follows:

Density = 239.2 g / 92 cm^3 = 2.6 g/cm^3