Đổi 75 cm = 0,75 m
Khi dùng thuỷ ngân: \(P=d_{Hg}\cdot h_{Hg}\)
Khi thay thuỷ ngân bằng rượu: \(P=d_{\text{rượu}}\cdot h_{\text{rượu}}\)
\(\Rightarrow d_{Hg}\cdot h_{Hg}=d_{\text{rượu}}\cdot h_{\text{rượu}}\)
\(\Rightarrow h_{\text{rượu}}=\dfrac{d_{Hg}}{d_{\text{rượu}}}\cdot h_{Hg}=\dfrac{136000}{8000}\cdot0,75=12,75\) (m)