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ρ=0,164g/dm³=0,164*10⁻³kg/10⁻³m³=0,164 kg/m³
m=Vρ=50*0,164=8,2 [m³*kg /m³ = kg]
Odp. 8,2 kg
V=50m3
V=50000dm3
m=V* 0,164g/dm3
m=50000dm3*0.164g/dm3=8200g
8200g=8,2kg
odp. masa helu w balonie wynosi 8,2kg