No. Steel and mercury are both good conductors (low resistance). Diamond and rubber are both insulators (high resistance).
- dGH or degree of general hardness - dKH or German degrees of hardness - mg/L of calcium carbonate or hydrocarbonate
The hardness of diamond on the Mohs scale is 10.
The hardness of En8 (having quite high C - 0.40%) will be dependent upon the supply condition - Annealed, Hardened, HT etc and may vary between say about 150 BHN to 40 HRC
Yes.