Shape, mass or volume.
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Density usually changes when an object is heated or cooled - especially in the case of gases, or when there is a change of phase.
Pressure Temperature Changes in the molecular structure(chemical change)
Typically two dozen cookies equal one pound. This number changes with the size and density of the cookies being weighed.
Graphs show the relationship of one quantity to another. For example, it may show how the density of a material changes when the temperature is increased, or it may show the inflation depending on time. Vertically you show the quantity of interest (density, inflation) and horizontally what it depends on (temperature, time). You measure / look up / guess for each temperature the density, and draw a dot which is above the given temperature and to the right of the given density, and you do that for many densities.
The density of golfball is less then density of water