Question

how does the density of substance vary with change in temperature

Answer 1

hey user!
we know that with the change in temperature, the volume of a substance changes. And density equals mass/volume . Hence it also changes.
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Answer 2

at a particular temperature high, the atoms or ions of that substance will change their form thereby reducing their density for example if rhombic sulphur where to be changed to amorphous state it defintely will change density because its form was changed due to shift in temperature.