Chemical Engineering Basics
The ratio of thermal & electrical conductivity is same for all the metals at the same temperature ; and at around room temperature, this ratio is proportional to(where, T = absolute temperature, °K)

T
1/T
1/T²

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Chemical Engineering Basics
Which of the following are made out of the carbon steel having carbon content of 0.9 to 1% ?

Small punches, broaches reamers and springs
Cutlery, screws, rivets and files
Forgings like can shaft, structural steel plate, threading dies and drawing dies
Mandrels, twist drills, small lathe tools and razors

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