Reciprocal of temperature coefficient of sheath material

Reciprocal of temperature coefficient of resistance at 0 $^{\circ}$C of the sheath material.

Symbol
$\beta_{sh}$
Unit
K
Formulae
$-20 + \frac{1}{\alpha_{sh}}$
Choices
MaterialValue
Cu234.5
Al230.3
Pb228.0
Brz313.0
S202.0
SS980.0
Zn230.0