ficial and of cubical expansion can befound from the above. The exact meaning of the neglect of the terms involving a2and a3 may be made more clear by the following. Let ABCD be a square each side of which is 1 cm. and letABCD be the same square when itstemperature has been raised 1°. Pro-duce AB… … 64-65] EXPANSION OF SOLIDS. 65 Hence also BE=BF= a. Hence area of parallelogram AE = a.area of parallelogram CF=a.area of square EF = a?. And the increase of area of the square centimetre A BCDis rectangle AE + square JSF+ rectangle OF or 2a + a8. In neglecting a2 compared with a we are neglecting…
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