Volumetric heat capacity steel pipe filling medium

The values for the possible filling material of the steel pipe are listed.

Symbol
$\sigma_{spf}$
Unit
J/(K.m$^3$)
Choices
CodeValueMaterialReference
Air1200.0Airσd,fill
N217000.0Nitrogenσd,fill
Oil1700000.0Dielectric oilσd,fill