Increase in volume of a solid on heating is cubical expansion.
Let V1 = Initial volume at t10C
V2 = its volume at t20C (t2>t1)
Then increase in volume 'v' = v2-v1
Increase in temperature 't' = t2-t1
The coefficient of cubical expansion is defined as the ratio of the increase in volume to its original volume for every degree increase in temperature. It is denoted by 'g'.
We can show that g = 3a
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