EQUIPMENT
    Wooden Expansion Model
  


NARRATIVE
            If a solid is considered to expand differentially the resultant volume is an approximation of the actual volume. For example, if a cube of original edge length L is heated, its edge will increase by DL. The new volume V is:

(L+DL)³ = L³ + 3L²DL + 3LDL² + DL³

Since we assume a differential expansion to be small, DL³ º 0.  Therefore, our approximation ignores DL³ which is a cubical section of the corner of the original cube of volume L³.