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Relative pressure coefficient

Values for calculation

$τ$
$φ_{δτ}$
$φ_δ$
$T$ $\mathrm{°C}$
$\text{Region}$

Calculation

Relative pressure coefficient

$\text{if }\ \text{Region}= 3$
$$α_p=\cfrac{1-\cfrac{τ\cdot φ_{δτ}}{φ_δ}}{T+273.15}$$
$\text{else}$
$$α_p=0$$