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u = udara,
c = zat cair
Fa = Wu - Wc ..pers 1
Fa = ρc. g. Vb ..pers 2
Wb = mb. g --> mb = Wb / g ..pers 3
Vb = mb / ρb ..pers 4
sehingga
(3)(4) Vb = Wb / g.ρb ..pers 5
(1) Wc = Wu - Fa
(2)(1) = Wu - (ρc .g. Vb)
(2)(1)(5) = Wu - (ρc. g. Wb / g.ρb)
= Wu - ( ρc. Wb / ρb) ------> Wb = Wu
= Wu - (ρc. Wu / ρb)
= Wu ( 1 - ρc/ρb)
kesimpulan : Wc = Wu ( 1 - ρc/ρb)
= 8,35 (1 - 0,75/2,7)
= 8,35 ( 1 - 0,28)
= 8,35 ( 0,72)
= 6,012 N
≈ 6 N