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...l of the cylinder) that are to be determined. Volume: Surface area (two ends plus the side): Next, combine these expressions by using information from one equation to simplify the other. Rearranging the equation for volume to express it in terms of length: We can substitute this expression for l into that for the surface area, bringing the problem down to one unknown, r,...

...l/l] Strain is represented by the Greek letter ε, called 'epsilon', and the length of the sample by the letter l. The Δ symbol (more Greek: this is the capital letter 'delta') is a shorthand way of saying 'the change in'. So Δ l means 'the change in l'. (Δ l is said by running the names of the letters together: 'delta el'.) Strain is a measure of ......