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φ₂= 0.7g/cm³ nafta
h₂= 20cm nafta
h₁=? woda
p = φgh
p₁=p₂
φ₁gh₁= φ₂gh₂
φ₁h₁= φ₂h₂
h₁=φ₂h₂/φ₁
h₁=20*0.7/1
h₁=14cm