Which of the following is the best definition of thermal expansion?
An object decreasing in size due to increased temperature.
Molecules moving faster.
An object increasing in size due to increased temperature.
An object remaining the same size no matter the temperature.
An object never changing in size.
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Answer:
An object increasing in size due to increased temperature is the best definition of thermal expansion.
Explanation:
In thermal expansion, when temperature increases, the shape, area, volume and density of the material also increases.
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