What is logic behind the use of Steel bar insted of gold
bar?

Answer Posted / sakthi

NOT ONLY BECAUSE OF THERMAL CO-EFFICIENT AND AVAILABILITY.
Consideration of these two factors also important.
Young's Modulus and Ultimate Strength.

Element Young's Modulus Ultimate Strength

Aluminum 70 45

Gold 79 100

silver 83 170

copper 130 210

Iron 211 350

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