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Formula Linear thermal expansion Initial length    Initial temperature    Final temperature    Coefficient of thermal expansion

Formula
Formula: Linear thermal expansion
Thermal expansion of a metallic rod

Length difference

Unit
Length of a metallic body (metal rod) which has changed after heating. If the metal rod is heated, it becomes longer!$$ \Delta l ~=~ l_1 ~-~ l_0 $$

Initial length

Unit
Length of the metal rod before heating.

Initial temperature

Unit
Temperature of the metal rod before heating.

Final temperature

Unit
Temperature of the metal rod after heating.

Coefficient of thermal expansion

Unit
Coefficient of thermal expansion is a material-dependent constant that tells how much a body expands when the temperature changes \( \Delta T ~=~ \class{red}{T_1} ~-~ \class{violet}{T_0} \).