# Ambient air temperature

For cables in troughs, this is the temperature of the ambient air above ground. This is taken as the inital air temperature inside the air-filled trough.

Symbol
$\theta_{air}$
Unit
$^{\circ}$C
Used in
$\alpha_{gas}$
$c_{p_{gas}}$
$\Delta \theta_{s}$
$\eta_{gas}$
$k_{gas}$
$\mathrm{Pr}_{gas}$
$\rho_{gas}$
Gas density [kg/m$^3$]
$T_{air}$
$T_{rad_{ext}}$
$\theta_{at_{0}}$
$W_{rad_{ext}}$