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Ph = ρ.g.h
ρ.g.h = ρ.g.h
1000.10.h(air) = 13600.10.1,5
h(air) = (13600.10.1,5)/(1000.10)
h(air)=20,4 cm
∆H= 20,4-1,5
=18,9 cm