How does density differ from volume

Density: Degree of consistency measured by the quantity of mass per unit volume.

Volume: Amount of space something takes up.

Density, however, is the mass of an object divided by its volume. ... This means that the lead has a higher density than cotton. To summarize, volume and density measure two different things. Volume measures how big the space of something is, whereas density measures the how much mass there is in this space (volume).

answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

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a 20-cm-long, cylindrical graphite (pure carbon) rod is inserted into an oxidizing atmosphere at 1145 k and 1.013 x 105 pa pressure. the oxidizing process is limited by the diffu- sion of oxygen counterflow to the carbon monoxide that is formed on the cylindrical surface.