Trạng thái 1: \(\left\{{}\begin{matrix}p_1=?\\t_1=30^0C\end{matrix}\right.\)
Trạng thái 2: \(\left\{{}\begin{matrix}p_2=70mlHg\\t_2=0^0C\end{matrix}\right.\)
Ta có:
\(\frac{p_1}{30+273}=\frac{70}{273}\Leftrightarrow p_1\approx77,7\left(mlHg\right)\)