Discussion
Soldering iron is made of copper due to which following reason?
Answer: D
Copper is used because it is a good conductor of heat.
The bit of a soldering iron must take heat from the heater (or flame) and pass it quickly to the joint, so that the solder melts and flows. Copper is one of the best thermal conductors among common metals, and solder wets it easily, which is why the bit is made of copper.
Weight and thermal expansion are not reasons for choosing it, and a bad conductor of heat would be useless for a soldering bit.
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