Question

does increasing the temperature of a material change its density? explain why or why not.

Explanation:

When the temperature of a material increases, its volume generally expands (thermal expansion) while the mass remains constant. Since density is defined as mass per unit volume ($
ho=\frac{m}{V}$), as volume $V$ increases with rising temperature and mass $m$ is unchanged, the density $
ho$ decreases. So, increasing the temperature of a material usually changes its density.

Answer:

Yes, increasing the temperature of a material usually changes its density because of thermal - expansion which changes the volume while mass remains constant.