Question

5.
When a substance undergoes thermal expansion, its
A. mass increases
B. volume decreases
C. particles get colder
D. particles spread out​

Answer 1

The volume increases. When a substance undergoes thermal expansion, what happens to the particles of the substance? They move apart.

Answer 2

When a substance undergoes thermal expansion, its volume increase.

Explanation:

• When an object undergoes thermal expansion, it changes its shape, area, and volume in response to a temperature change.
• Its mass does not change, but there is an increase in its volume and a decrease in its density.
• They move apart. The process that transfers energy by the movement of large numbers of particles in the same direction within a liquid or gas.
• Thermal expansion causes the density of a substance to decrease, because the same mass takes up more volume.Cracks in the road when the road expands on heating.
• Sags in electrical power lines.Thermal expansion is the tendency of matter to change in shape, area, and volume in response to a change in temperature