p = p_{1} + p_{2} = 2 p_{2} = 2 ρ_{2} g h_{2} \approx 3100 P a = 3, 1 k P a

${p = p_1 + p_2 = 2p_2 = 2 \rho_{2} gh_2 \approx {3100}\,\mathrm{Pa} = {3,1}\,\mathrm{kPa}}$

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