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konsep tekanan dlm bejana
P kiri = P kanan
P kiri : terdiri dari raksa dan air
P kiri = ρ raksa. g. h raksa + ρ air . g. h air
=13,6. g. 1 + 1.g.h air
= 13,6 g + h air g
= g ( 13,6 + h air)
P kanan = ρ alkohol. g. h alkohol
= 0,8.g. 20
= 16 g
P kiri = P kanan
g (13,6 + h air) = 16 g
13,6 + h air = 16
h air = 16-13,6
= 2,4 cm