The relationship between linear expansivity and area expansivity:
The linear expansivity of a material is equal to half times the area expansivity of a material.
HENCE area expansivity =2 x linear expansivity
The relationship between linear expansivity and volume expansivity:
The linear expansivity of a material equals to one third of the volume expansivity of the material.
HENCE volume expansivity = 3 x linear expansivity
These relationships should be remembered , because in the question only one form of linear expansivity will be given and you have to deduce the other forms.
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