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Region

Values for calculation

$T$ $\mathrm{°C}$
$p$ $\mathrm{Pa}$
$P_{SV}$ $\mathrm{Pa}$

Calculation

Region

$\text{if }\ \left(T+273.15\right)> 1073.15$
$$\text{Region}=5$$
$\text{else if }\ p> P_{SV}\wedge \left(T+273.15\right)< 623.15$
$$\text{Region}=1$$
$\text{else if }\ p> P_{SV}$
$$\text{Region}=3$$
$\text{else}$
$$\text{Region}=2$$