Reciprocal of temperature coefficient of armour material

Reciprocal of temperature coefficient of resistance at 0 °C of the armour material.

Symbol
$\beta_{ar}$
Unit
K
Formulae
$\frac{1}{\alpha_{ar}}-20$
Choices
ConstructionValue
Cu234.5
Al230.3
Brz313.0
CuZn506.3
S202.0
SS980.0