Physics
Grade-9
Easy
Question
When the temperature of a substance decreases, it ____.
- Melts
- Boils
- Expands
- Contracts
Hint:
As the temperature decreases, the average kinetic energy of the particles decreases
The correct answer is: Contracts
- Thermal contraction is a decrease in a material's volume when its temperature decreases. As the temperature decreases, the average kinetic energy of the particles decreases and they slow down and get closer together thereby decreasing the volume of the material.
- So on decreasing the temperature it contracts
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